Institution: | 1. Dutch College of General Practitioners, Utrecht, The Netherlands, PO Box 3231, 3502, GE, Utrecht, The Netherlands 2. Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, PO Box 85500, HP. Stratenum 6.109, 3500, AB, Utrecht, The Netherlands 3. Centre for Infectious Disease Control, National Institute for Public Health and the Environment (RIVM), Antonie van Leeuwenhoeklaan 9, 3721, MA, Bilthoven, The Netherlands
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