Erratum to: SpringerPlus (2016) 5:386 DOI 10.1186/s40064-016-2033-8

Upon publication, it was noticed that in the original version of the article (López Sánchez et al. 2016), Sixto González-Víllora’s name was incorrectly given as Sixto González Víllora. This has now been corrected in this erratum.