Authors: Marcel Zwahlen; Ross Harris; Margaret May; Robert Hogg; Dominique Costagliola; Frank de Wolf; John Gill; Gerd Fätkenheuer; Charlotte Lewden; Mike Saag; Sholmo Staszewski; Antonella d'Arminio Monforte; Jordi Casabona; Fiona Lampe; Amy Justice; Viktor von Wyl; Matthias Egger Journal: Int J Epidemiol Date: 2009-10-09 Impact factor: 7.196