Skip to main content

Advertisement

Log in

The neurobiology of falls

  • Review Article
  • Published:
Neurological Sciences Aims and scope Submit manuscript

Abstract

Falling is a major clinical problem; especially, in elderly population as it often leads to fractures, immobilization, poor quality of life and life-span reduction. Given the growing body of evidences on the physiopathology of balance disorders in humans, in recent years the approach of research on falls has completely changed and new instruments and new definitions have been formulated. Among them, the definition of “idiopathic faller” (i.e. no overt cause for falling in a given subject) represented a milestone in building the “science of falling”. This review deals with the new determinants of the neurobiology of falling: (1) the role of motor impairment and particularly of those “mild parkinsonian signs” frequently detectable in elderly subjects, (2) the role of executive and attentive resources when coping with obstacles, (3) the role of vascular lesions in “highest level gait disorder” (a condition tightly connected with senile gait, cautious gait and frailty), (4) the role of the failure of automaticity or inter-limbs coordination/symmetry during walking and such approach would definitely help the development of screening instrument for subjects at risk (still lacking in present days). This translational approach will lead to the development of specific therapeutic interventions.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1
Fig. 2
Fig. 3
Fig. 4

Similar content being viewed by others

References

  1. Alexander BH, Rivara FP, Wolf ME (1992) The cost and frequency of hospitalization for fall-related injuries in older adults. Am J Public Health 82(7):1020–1023

    Article  PubMed  CAS  Google Scholar 

  2. Close J, Ellis M, Hooper R, Glucksman E, Jackson S, Swift C (1999) Prevention of falls in the elderly trial (PROFET): a randomised controlled trial. Lancet 353(9147):93–97

    Article  PubMed  CAS  Google Scholar 

  3. Tinetti ME, Speechley M, Ginter SF (1988) Risk factors for falls among elderly persons living in the community. N Engl J Med 319(26):1701–1707

    Article  PubMed  CAS  Google Scholar 

  4. Fuller GF (2000) Falls in the elderly. Am Fam Phys 61(7):2159–2168, 2173–2154

    Google Scholar 

  5. Ganz DA, Bao Y, Shekelle PG, Rubenstein LZ (2007) Will my patient fall? Jama 297(1):77–86

    Article  PubMed  Google Scholar 

  6. Wallmann HW (2001) Comparison of elderly nonfallers and fallers on performance measures of functional reach, sensory organization, and limits of stability. J Gerontol A Biol Sci Med Sci 56(9):M580–M583

    Article  PubMed  CAS  Google Scholar 

  7. Butler AA, Lord SR, Fitzpatrick RC (2011) Reach distance but not judgment error is associated with falls in older people. J Gerontol A Biol Sci Med Sci 66(8):896–903

    Article  PubMed  Google Scholar 

  8. Tucker MG, Kavanagh JJ, Morrison S, Barrett RS (2010) What are the relations between voluntary postural sway measures and falls-history status in community-dwelling older adults? Arch Phys Med Rehabil 91(5):750–758

    Article  PubMed  Google Scholar 

  9. Capezuti E (2004) Building the science of falls–prevention research. J Am Geriatr Soc 52(3):461–462

    Article  PubMed  Google Scholar 

  10. Thurman DJ, Stevens JA, Rao JK (2008) Practice parameter: assessing patients in a neurology practice for risk of falls (an evidence-based review): report of the Quality Standards Subcommittee of the American Academy of Neurology. Neurology 70(6):473–479

    Article  PubMed  Google Scholar 

  11. Hausdorff JM (2007) Gait dynamics, fractals and falls: finding meaning in the stride-to-stride fluctuations of human walking. Hum Mov Sci 26(4):555–589

    Article  PubMed  Google Scholar 

  12. Buchner DM, Hornbrook MC, Kutner NG, Tinetti ME, Ory MG, Mulrow CD, Schechtman KB, Gerety MB, Fiatarone MA, Wolf SL et al (1993) Development of the common data base for the FICSIT trials. J Am Geriatr Soc 41(3):297–308

    PubMed  CAS  Google Scholar 

  13. Grue EV, Kirkevold M, Ranhoff AH (2009) Prevalence of vision, hearing, and combined vision and hearing impairments in patients with hip fractures. J Clin Nurs 18(21):3037–3049

    Article  PubMed  Google Scholar 

  14. De Carli P, Patrizi M, Pepe L, Cavaniglia G, Riva D, D’Ottavi LR (2010) Postural control and risk of falling in bipodalic and monopodalic stabilometric tests of healthy subjects before, after visuo-proprioceptive vestibulo-postural rehabilitation and at 3 months thereafter: role of the proprioceptive system. Acta Otorhinolaryngol Ital 30(4):182–189

    PubMed  Google Scholar 

  15. Gazzola JM, Gananca FF, Aratani MC, Perracini MR, Gananca MM (2006) Circumstances and consequences of falls in elderly people with vestibular disorder. Braz J Otorhinolaryngol 72(3):388–392

    PubMed  Google Scholar 

  16. Horlings CG, van Engelen BG, Allum JH, Bloem BR (2008) A weak balance: the contribution of muscle weakness to postural instability and falls. Nat Clin Pract Neurol 4(9):504–515

    Article  PubMed  Google Scholar 

  17. Parker SG (1988) Causes of ataxia in patients attending a falls laboratory. Age Ageing 17(5):355

    Article  PubMed  CAS  Google Scholar 

  18. Horak FB, Nutt JG, Nashner LM (1992) Postural inflexibility in parkinsonian subjects. J Neurol Sci 111(1):46–58

    Article  PubMed  CAS  Google Scholar 

  19. Adkin AL, Frank JS, Carpenter MG, Peysar GW (2002) Fear of falling modifies anticipatory postural control. Exp Brain Res 143(2):160–170

    Article  PubMed  Google Scholar 

  20. Thijs RD, Bloem BR, van Dijk JG (2009) Falls, faints, fits and funny turns. J Neurol 256(2):155–167

    Article  PubMed  Google Scholar 

  21. Giladi N, Nieuwboer A (2008) Understanding and treating freezing of gait in parkinsonism, proposed working definition, and setting the stage. Mov Disord 23(Suppl 2):S423–S425

    Article  PubMed  Google Scholar 

  22. Factor SA (2008) The clinical spectrum of freezing of gait in atypical parkinsonism. Mov Disord 23(Suppl 2):S431–S438

    Article  PubMed  Google Scholar 

  23. Bloem BR, Hausdorff JM, Visser JE, Giladi N (2004) Falls and freezing of gait in Parkinson’s disease: a review of two interconnected, episodic phenomena. Mov Disord 19(8):871–884

    Article  PubMed  Google Scholar 

  24. Moore O, Peretz C, Giladi N (2007) Freezing of gait affects quality of life of peoples with Parkinson’s disease beyond its relationships with mobility and gait. Mov Disord 22(15):2192–2195

    Article  PubMed  Google Scholar 

  25. Bloem BR, Beckley DJ, van Dijk JG (1999) Are automatic postural responses in patients with Parkinson’s disease abnormal due to their stooped posture? Exp Brain Res 124(4):481–488

    Article  PubMed  CAS  Google Scholar 

  26. Nutt JG, Bloem BR, Giladi N, Hallett M, Horak FB, Nieuwboer A (2011) Freezing of gait: moving forward on a mysterious clinical phenomenon. Lancet Neurol 10(8):734–744

    Article  PubMed  Google Scholar 

  27. Hausdorff JM, Schaafsma JD, Balash Y, Bartels AL, Gurevich T, Giladi N (2003) Impaired regulation of stride variability in Parkinson’s disease subjects with freezing of gait. Exp Brain Res 149(2):187–194

    PubMed  CAS  Google Scholar 

  28. Plotnik M, Giladi N, Balash Y, Peretz C, Hausdorff JM (2005) Is freezing of gait in Parkinson’s disease related to asymmetric motor function? Ann Neurol 57(5):656–663

    Article  PubMed  Google Scholar 

  29. Plotnik M, Giladi N, Hausdorff JM (2008) Bilateral coordination of walking and freezing of gait in Parkinson’s disease. Eur J Neurosci 27(8):1999–2006

    Article  PubMed  Google Scholar 

  30. Chee R, Murphy A, Danoudis M, Georgiou-Karistianis N, Iansek R (2009) Gait freezing in Parkinson’s disease and the stride length sequence effect interaction. Brain 132(Pt 8):2151–2160

    Article  PubMed  Google Scholar 

  31. Jacobs JV, Nutt JG, Carlson-Kuhta P, Stephens M, Horak FB (2009) Knee trembling during freezing of gait represents multiple anticipatory postural adjustments. Exp Neurol 215(2):334–341

    Article  PubMed  Google Scholar 

  32. Amboni M, Barone P, Picillo M, Cozzolino A, Longo K, Erro R, Iavarone A (2010) A two-year follow-up study of executive dysfunctions in parkinsonian patients with freezing of gait at on-state. Mov Disord 25(6):800–802

    Article  PubMed  Google Scholar 

  33. Amboni M, Cozzolino A, Longo K, Picillo M, Barone P (2008) Freezing of gait and executive functions in patients with Parkinson’s disease. Mov Disord 23(3):395–400

    Article  PubMed  Google Scholar 

  34. Naismith SL, Shine JM, Lewis SJ (2010) The specific contributions of set-shifting to freezing of gait in Parkinson’s disease. Mov Disord 25(8):1000–1004

    Article  PubMed  Google Scholar 

  35. Stolze H, Petersen G, Raethjen J, Wenzelburger R, Deuschl G (2001) The gait disorder of advanced essential tremor. Brain 124(Pt 11):2278–2286

    Article  PubMed  CAS  Google Scholar 

  36. Abdo WF, Borm GF, Munneke M, Verbeek MM, Esselink RA, Bloem BR (2006) Ten steps to identify atypical parkinsonism. J Neurol Neurosurg Psychiatry 77(12):1367–1369

    Article  PubMed  CAS  Google Scholar 

  37. Piirtola M, Era P (2006) Force platform measurements as predictors of falls among older people: a review. Gerontology 52(1):1–16

    Article  PubMed  Google Scholar 

  38. Pickering RM, Grimbergen YA, Rigney U, Ashburn A, Mazibrada G, Wood B, Gray P, Kerr G, Bloem BR (2007) A meta-analysis of six prospective studies of falling in Parkinson’s disease. Mov Disord 22(13):1892–1900

    Article  PubMed  Google Scholar 

  39. Fasano A, Plotnik M (2012) Neurologic aspects and falls. Clin Cases Miner Bone Metab (in press)

  40. Louis ED, Tang MX, Schupf N, Mayeux R (2005) Functional correlates and prevalence of mild parkinsonian signs in a community population of older people. Arch Neurol 62(2):297–302

    Article  PubMed  Google Scholar 

  41. Louis ED, Bennett DA (2007) Mild Parkinsonian signs: an overview of an emerging concept. Mov Disord 22(12):1681–1688

    Article  PubMed  Google Scholar 

  42. Israeli-Korn SD, Massarwa M, Schechtman E, Strugatsky R, Avni S, Farrer LA, Friedland RP, Inzelberg R (2010) Mild cognitive impairment is associated with mild parkinsonian signs in a door-to-door study. J Alzheimers Dis 22(3):1005–1013

    PubMed  Google Scholar 

  43. Louis ED, Schupf N, Manly J, Marder K, Tang MX, Mayeux R (2005) Association between mild parkinsonian signs and mild cognitive impairment in a community. Neurology 64(7):1157–1161

    Article  PubMed  CAS  Google Scholar 

  44. Zhou G, Duan L, Sun F, Yan B, Ren S (2010) Association between mild parkinsonian signs and mortality in an elderly male cohort in China. J Clin Neurosci 17(2):173–176

    Article  PubMed  Google Scholar 

  45. de Laat KF, van Norden AG, van Oudheusden LJ, van Uden IW, Norris DG, Zwiers MP, de Leeuw FE (2011) Diffusion tensor imaging and mild parkinsonian signs in cerebral small vessel disease. Neurobiol Aging. doi:10.1016/j.neurobiolaging.2011.09.001

  46. Louis ED, Brickman AM, DeCarli C, Small SA, Marder K, Schupf N, Brown TR (2008) Quantitative brain measurements in community-dwelling elderly persons with mild parkinsonian signs. Arch Neurol 65(12):1649–1654

    Article  PubMed  Google Scholar 

  47. Blahak C, Baezner H, Pantoni L, Poggesi A, Chabriat H, Erkinjuntti T, Fazekas F, Ferro JM, Langhorne P, O’Brien J, Visser MC, Wahlund LO, Waldemar G, Wallin A, Inzitari D, Hennerici MG (2009) Deep frontal and periventricular age related white matter changes but not basal ganglia and infratentorial hyperintensities are associated with falls: cross sectional results from the LADIS study. J Neurol Neurosurg Psychiatry 80(6):608–613

    Article  PubMed  CAS  Google Scholar 

  48. Luu P, Flaisch T, Tucker DM (2000) Medial frontal cortex in action monitoring. J Neurosci 20(1):464–469

    PubMed  CAS  Google Scholar 

  49. Jacobs JV, Horak FB (2007) Cortical control of postural responses. J Neural Transm 114(10):1339–1348

    Article  PubMed  CAS  Google Scholar 

  50. Skoyles JR (2006) Human balance, the evolution of bipedalism and dysequilibrium syndrome. Med Hypotheses 66(6):1060–1068

    Article  PubMed  Google Scholar 

  51. Tan U (2008) Unertan syndrome: review and report of four new cases. Int J Neurosci 118(2):211–225

    Article  PubMed  Google Scholar 

  52. Bloem BR, Steijns JA, Smits-Engelsman BC (2003) An update on falls. Curr Opin Neurol 16(1):15–26

    Article  PubMed  Google Scholar 

  53. Berner Y, Shabat S, Mann G, Stern A, Sagiv P, Nyska M (2002) Comorbidity of distal radius (Colles’ type) and hip fractures implies a better outcome in older patients. J Am Geriatr Soc 50(5):976–977

    Article  PubMed  Google Scholar 

  54. Lundin-Olsson L, Nyberg L, Gustafson Y (1997) “Stops walking when talking” as a predictor of falls in elderly people. Lancet 349(9052):617

    Article  PubMed  CAS  Google Scholar 

  55. Pellecchia GL (2003) Postural sway increases with attentional demands of concurrent cognitive task. Gait Posture 18(1):29–34

    Article  PubMed  Google Scholar 

  56. Dubost V, Kressig RW, Gonthier R, Herrmann FR, Aminian K, Najafi B, Beauchet O (2006) Relationships between dual-task related changes in stride velocity and stride time variability in healthy older adults. Hum Mov Sci 25(3):372–382

    Article  PubMed  Google Scholar 

  57. Springer S, Giladi N, Peretz C, Yogev G, Simon ES, Hausdorff JM (2006) Dual-tasking effects on gait variability: the role of aging, falls, and executive function. Mov Disord 21(7):950–957

    Article  PubMed  Google Scholar 

  58. Bond JM, Morris M (2000) Goal-directed secondary motor tasks: their effects on gait in subjects with Parkinson disease. Arch Phys Med Rehabil 81(1):110–116

    PubMed  CAS  Google Scholar 

  59. Bloem BR, Valkenburg VV, Slabbekoorn M, van Dijk JG (2001) The multiple tasks test. Strategies in Parkinson’s disease. Exp Brain Res 137(3–4):478–486

    Article  PubMed  CAS  Google Scholar 

  60. Yang YR, Chen YC, Lee CS, Cheng SJ, Wang RY (2007) Dual-task-related gait changes in individuals with stroke. Gait Posture 25(2):185–190

    Article  PubMed  Google Scholar 

  61. Plotnik M, Giladi N, Dagan Y, Hausdorff JM (2011) Postural instability and fall risk in Parkinson’s disease: impaired dual tasking, pacing, and bilateral coordination of gait during the “ON” medication state. Exp Brain Res 210(3–4):529–538

    Article  PubMed  Google Scholar 

  62. Bloem BR, Grimbergen YA, van Dijk JG, Munneke M (2006) The “posture second” strategy: a review of wrong priorities in Parkinson’s disease. J Neurol Sci 248(1–2):196–204

    Article  PubMed  Google Scholar 

  63. Camicioli R, Howieson D, Lehman S, Kaye J (1997) Talking while walking: the effect of a dual task in aging and Alzheimer’s disease. Neurology 48(4):955–958

    Article  PubMed  CAS  Google Scholar 

  64. Sheridan PL, Solomont J, Kowall N, Hausdorff JM (2003) Influence of executive function on locomotor function: divided attention increases gait variability in Alzheimer’s disease. J Am Geriatr Soc 51(11):1633–1637

    Article  PubMed  Google Scholar 

  65. Burn DJ, Rowan EN, Allan LM, Molloy S, O’Brien JT, McKeith IG (2006) Motor subtype and cognitive decline in Parkinson’s disease, Parkinson’s disease with dementia, and dementia with Lewy bodies. J Neurol Neurosurg Psychiatry 77(5):585–589

    Article  PubMed  CAS  Google Scholar 

  66. Hausdorff JM, Yogev G, Springer S, Simon ES, Giladi N (2005) Walking is more like catching than tapping: gait in the elderly as a complex cognitive task. Exp Brain Res 164(4):541–548

    Article  PubMed  Google Scholar 

  67. Leipzig RM, Cumming RG, Tinetti ME (1999) Drugs and falls in older people: a systematic review and meta-analysis: I Psychotropic drugs. J Am Geriatr Soc 47(1):30–39

    PubMed  CAS  Google Scholar 

  68. Chung KA, Lobb BM, Nutt JG, Horak FB (2010) Effects of a central cholinesterase inhibitor on reducing falls in Parkinson disease. Neurology 75(14):1263–1269

    Article  PubMed  CAS  Google Scholar 

  69. Nutt JG, Marsden CD, Thompson PD (1993) Human walking and higher-level gait disorders, particularly in the elderly. Neurology 43(2):268–279

    Article  PubMed  CAS  Google Scholar 

  70. Sudarsky L, Ronthal M (1983) Gait disorders among elderly patients: a survey study of 50 patients. Arch Neurol 40(12):740–743

    Article  PubMed  CAS  Google Scholar 

  71. Giladi N, Herman T, Reider G II, Gurevich T, Hausdorff JM (2005) Clinical characteristics of elderly patients with a cautious gait of unknown origin. J Neurol 252(3):300–306

    Article  PubMed  CAS  Google Scholar 

  72. Thompson PD (2007) Higher level gait disorders. Curr Neurol Neurosci Rep 7(4):290–294

    Article  PubMed  Google Scholar 

  73. Giladi N, Huber-Mahlin V, Herman T, Hausdorff JM (2007) Freezing of gait in older adults with high level gait disorders: association with impaired executive function. J Neural Transm 114(10):1349–1353

    Article  PubMed  CAS  Google Scholar 

  74. Chang CM, Yu YL, Ng HK, Leung SY, Fong KY (1992) Vascular pseudoparkinsonism. Acta Neurol Scand 86(6):588–592

    Article  PubMed  CAS  Google Scholar 

  75. Hennerici MG, Oster M, Cohen S, Schwartz A, Motsch L, Daffertshofer M (1994) Are gait disturbances and white matter degeneration early indicators of vascular dementia? Dementia 5(3–4):197–202

    PubMed  CAS  Google Scholar 

  76. Dietz V (2002) Do human bipeds use quadrupedal coordination? Trends Neurosci 25(9):462–467

    Article  PubMed  Google Scholar 

  77. Hausdorff JM, Rios DA, Edelberg HK (2001) Gait variability and fall risk in community-living older adults: a 1-year prospective study. Arch Phys Med Rehabil 82(8):1050–1056

    Article  PubMed  CAS  Google Scholar 

  78. Lord S, Howe T, Greenland J, Simpson L, Rochester L (2011) Gait variability in older adults: a structured review of testing protocol and clinimetric properties. Gait Posture 34(4):443–450

    Article  PubMed  Google Scholar 

  79. Sadeghi H, Allard P, Prince F, Labelle H (2000) Symmetry and limb dominance in able-bodied gait: a review. Gait Posture 12(1):34–45

    Article  PubMed  CAS  Google Scholar 

  80. Choi JT, Bastian AJ (2007) Adaptation reveals independent control networks for human walking. Nat Neurosci 10(8):1055–1062

    Article  PubMed  CAS  Google Scholar 

  81. Plotnik M, Giladi N, Hausdorff JM (2007) A new measure for quantifying the bilateral coordination of human gait: effects of aging and Parkinson’s disease. Exp Brain Res 181(4):561–570

    Article  PubMed  Google Scholar 

  82. Yogev G, Plotnik M, Peretz C, Giladi N, Hausdorff JM (2007) Gait asymmetry in patients with Parkinson’s disease and elderly fallers: when does the bilateral coordination of gait require attention? Exp Brain Res 177(3):336–346

    Article  PubMed  Google Scholar 

  83. Plotnik M, Giladi N, Hausdorff JM (2009) Bilateral coordination of gait and Parkinson’s disease: the effects of dual tasking. J Neurol Neurosurg Psychiatry 80(3):347–350

    Article  PubMed  CAS  Google Scholar 

  84. Bhala RP, O’Donnell J, Thoppil E (1982) Ptophobia. Phobic fear of falling and its clinical management. Phys Ther 62(2):187–190

    PubMed  CAS  Google Scholar 

  85. Bloem BR, Boers I, Cramer M, Westendorp RG, Gerschlager W (2001) Falls in the elderly. I. Identification of risk factors. Wien Klin Wochenschr 113(10):352–362

    PubMed  CAS  Google Scholar 

  86. Voermans NC, Snijders AH, Schoon Y, Bloem BR (2007) Why old people fall (and how to stop them). Pract Neurol 7(3):158–171

    Article  PubMed  CAS  Google Scholar 

  87. Mak MK, Pang MY (2009) Fear of falling is independently associated with recurrent falls in patients with Parkinson’s disease: a 1-year prospective study. J Neurol 256(10):1689–1695

    Article  PubMed  Google Scholar 

  88. Brozova H, Stochl J, Roth J, Ruzicka E (2009) Fear of falling has greater influence than other aspects of gait disorders on quality of life in patients with Parkinson’s disease. Neuro Endocrinol Lett 30(4):453–457

    PubMed  Google Scholar 

  89. Nutt JG, Horak FB, Bloem BR (2011) Milestones in gait, balance, and falling. Mov Disord 26(6):1166–1174

    Article  PubMed  Google Scholar 

  90. Bohnen NI, Muller ML, Koeppe RA, Studenski SA, Kilbourn MA, Frey KA, Albin RL (2009) History of falls in Parkinson disease is associated with reduced cholinergic activity. Neurology 73(20):1670–1676

    Article  PubMed  CAS  Google Scholar 

  91. Gilman S, Koeppe RA, Nan B, Wang CN, Wang X, Junck L, Chervin RD, Consens F, Bhaumik A (2010) Cerebral cortical and subcortical cholinergic deficits in parkinsonian syndromes. Neurology 74(18):1416–1423

    Article  PubMed  CAS  Google Scholar 

  92. Moro E, Hamani C, Poon YY, Al-Khairallah T, Dostrovsky JO, Hutchison WD, Lozano AM (2010) Unilateral pedunculopontine stimulation improves falls in Parkinson’s disease. Brain 133(Pt 1):215–224

    Article  PubMed  Google Scholar 

  93. Ben-Itzhak R, Giladi N, Gruendlinger L, Hausdorff JM (2008) Can methylphenidate reduce fall risk in community-living older adults? A double-blind, single-dose cross-over study. J Am Geriatr Soc 56(4):695–700

    Article  PubMed  Google Scholar 

  94. Fasano A, Piano C, De Simone C, Cioni B, Di Giuda D, Zinno M, Daniele A, Meglio M, Giordano A, Bentivoglio AR (2008) High frequency extradural motor cortex stimulation transiently improves axial symptoms in a patient with Parkinson’s disease. Mov Disord 23(13):1916–1919

    Article  PubMed  Google Scholar 

  95. Marsden CD, Merton PA, Morton HB (1978) Anticipatory postural responses in the human subject [proceedings]. J Physiol 275:47P–48P

    PubMed  CAS  Google Scholar 

  96. Albanese A (1991) I gangli motori e i disturbi del movimento. Neurobiologia clinica. Piccin nuova libraria spa, Padova

Download references

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Alfonso Fasano.

Additional information

A. Fasano and M. Plotnik equally contributed to the work.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Fasano, A., Plotnik, M., Bove, F. et al. The neurobiology of falls. Neurol Sci 33, 1215–1223 (2012). https://doi.org/10.1007/s10072-012-1126-6

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s10072-012-1126-6

Keywords

Navigation