Knol Mirjam J, Le Cessie Saskia, Algra Ale, Vandenbroucke Jan P, Groenwold Rolf H H
Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, The Netherlands.
CMAJ. 2012 May 15;184(8):895-9. doi: 10.1503/cmaj.101715. Epub 2011 Dec 12.