Publication info: Int J Epidemiol. 2010 Jun; 39(3):710-7.PMID: 20378687External link: http://www.ncbi.nlm.nih.gov/pubmed/20378687Publication date: June, 2010Authors: Lejeune C, Sassi F, Ellis L, Godward S, Mak V, Day M, Rachet BPublication type: Paper