Huisman Martijn, Poppelaars Jan, van der Horst Marleen, Beekman Aartjan T F, Brug Johannes, van Tilburg Theo G, Deeg Dorly J H
EMGO Institute for Health and Care Research, VU University Medical Center, Amsterdam, The Netherlands.
Int J Epidemiol. 2011 Aug;40(4):868-76. doi: 10.1093/ije/dyq219. Epub 2011 Jan 6.