van Eijsden Manon, Vrijkotte Tanja G M, Gemke Reinoud J B J, van der Wal Marcel F
Department of Epidemiology, Documentation and Health Promotion, Public Health Service of Amsterdam, Amsterdam, The Netherlands.
Int J Epidemiol. 2011 Oct;40(5):1176-86. doi: 10.1093/ije/dyq128. Epub 2010 Sep 2.