1. University Medical Center Utrecht; Department of Internal Medicine; Heidelberglaan 100 UMCU postbox F02.126 3508 GA Utrecht Netherlands
2. Zonnehuisgroep Amstelland (KBO); Laan van de Helende Meesters 12 Amstelveen Netherlands 1186 AM
3. Radboud University Nijmegen Medical Center; Department of Primary and Community Care, 117 ELG; PO Box 9101 route 117 Nijmegen Netherlands 6500 HB