1. Interaction: A word with two meanings creates confusion

   • Anders Ahlbom
   • Lars Alfredsson

   Editorial Pages: 563 - 564

2. Causality in cancer epidemiology

   • Pagona Lagiou
   • Hans-Olov Adami
   • Dimitrios Trichopoulos

   Review Pages: 565 - 574

3. Calculating measures of biological interaction

   • Tomas Andersson
   • Lars Alfredsson
   • Anders Ahlbom

   Methods Pages: 575 - 579

4. A study on methods of estimating the population size of men who have sex with men in Southwest China

   • Rongsheng Luan
   • Gang Zeng
   • Yuan Li

   OriginalPaper Pages: 581 - 585

5. Can morbidity be inferred from prescription drug use? Results from a nation-wide prison population study

   • Ellen Kjelsberg
   • Paal Hartvig

   OriginalPaper Pages: 587 - 592

6. Genotype frequencies at codon 129 of the Prion Protein Gene in Brazil: implications in susceptibility to variant Creutzfeldt--Jakob disease compared to European and Asian populations

   • Erich Vinicius de Paula
   • Marcelo Addas-Carvalho
   • Simone Cristina Olenscki Gilli

   Genetic Epidemiology Pages: 593 - 595

7. Short and long term association of a single serum cholesterol measurement in middle-aged men in prediction of fatal coronary and other cardiovascular events: A cross-cultural comparison through Europe

   • Alessandro Menotti
   • Mariapaola Lanti
   • Aulikki Nissinen

   Cardiovascular Diseases Pages: 597 - 604

8. Different risk factor profiles between subtypes of ischemic stroke. A case-control study in Korean men

   • Yun-Mi Song
   • Sun Uck Kwon
   • Yeong Sook Yun

   OriginalPaper Pages: 605 - 612

9. Multiple births and breast cancer prognosis: A population based study

   • Lukman Thalib
   • Suhail A.R. Doi
   • Per Hall

   Cancer Pages: 613 - 617

10. A 9 year prospective cohort study of endoscoped patients with upper gastrointestinal symptoms

    • Johanna I. Westbrook
    • Anne E. Duggan
    • Mary T. Westbrook

    Gastrointestinal Diseases Pages: 619 - 627

11. Applying a case-crossover study design to examine transient exposures in the transmission of N. meningitidis

    • R. Reintjes
    • H. Kajueter
    • A. Ammon

    Infectious Diseases Pages: 629 - 633

12. Outbreak of typhoid fever in vaccinated members of the French Armed Forcesin the Ivory Coast

    • Rémy Michel
    • Eric Garnotel
    • Jean-Paul Boutin

    OriginalPaper Pages: 635 - 642

13. Community epidemiology of Chlamydia and Mycoplasma pneumoniae in LRTI in France over 29 months

    • Jacques Gaillat
    • Antoine Flahault
    • Charles Mayaud

    OriginalPaper Pages: 643 - 651