1. EMGO Institute for Health and Care Research, VU University Medical Center; Department of General Practice and Elderly Care Medicine; Van der Boechorststraat 7, room D-550 Amsterdam Netherlands 1081 BT
2. VU University Medical Center; Department of General Practice and Elderly Care Medicine, EMGO Institute for Health and Care Research; PO Box 7057 Amsterdam Netherlands 1007 MB
3. Philipps-University Marburg; Department of Clinical Psychology and Psychotherapy; Gutenbergstr. 18 Marburg Hessen Germany D-35032
4. Netherlands Institute of Mental Health and Addiction (Trimbos Institute); Department of Public Mental Health; Da Costakade 45 Utrecht Netherlands 3521 VS
5. LUMC; Department of Public Health and Primary Care; PO Box 9600 Leiden Netherlands 2300 RC