The order of the authors of the paper by Chaix et al in the January issue of JECH were published incorrectly (B Chaix, M Lindström, J Merlo, and M Rosvall. Neighbourhood social interactions and risk of acute myocardial infarction. J Epidemiol Community Health 2008;62:62–8). J Merlo is in fact the last author of the paper. The publisher apologises for this mistake.