Affiliation: | 1. Centre for Infectious Disease Control, National Institute of Public Health and the Environment (RIVM), PO Box 1, 3720 BA Bilthoven, Netherlands;2. Department of Public Health Medicine, School of Public Health, University of Bielefeld, Bielefeld, Germany;3. Centre for Prevention and Health Services Research, National Institute of Public Health and the Environment (RIVM), Bilthoven, Netherlands |