1. From the Julius Center for Health Sciences and Primary Care, University Medical Center, Utrecht, Netherlands (CSPMU, PHMP, and DEG); the Centers for Prevention and Health Services Research (WMMV), for Nutrition and Health (HBBdM, MO, and EJMF), and for Information Technology and Methodology (HCB), National Institute of Public Health and the Environment, Bilthoven, Netherlands; and the Division of