1. Erasmus Medical Center; Department of General Practice; PO Box 2040 Rotterdam Netherlands 3000CA
2. Rotterdam University of Applied Sciences; Research Centre Innovations in Care; Rochussenstraat 198 Rotterdam Netherlands 3015 EK Rotterdam
3. Oregon Health and Science University; Department of Family Medicine, Dept. of Medicine, Dept. of Public Health & Preventive Medicine; 3181 SW Sam Jackson Park Road Mail code FM Portland OR USA 97239
4. VU University Amsterdam; Department of Health Sciences, Faculty of Earth and Life Sciences; PO Box 7057 Room U454 Amsterdam Netherlands 1007 MB