1. Aarhus University; Research Unit for General Practice, Institute of Public Health; Bartholins Alle 2 Århus Denmark DK-8000
2. VU University Medical Center; Department of General Practice and Elderly Care Medicine; PO Box 7057 Amsterdam Netherlands 1007 MB
3. University of Nottingham; Psychiatry; A Floor, South Block Nottingham UK NG7 2UH
4. Århus University Hospital; Research Clinic for Functional Disorders and Psychosomatics; Noerrebrogade 44 Århus Denmark 8000
5. University of Oxford; Department of Psychiatry; Warneford Hospital Oxford UK OX3 7JX
6. University of Aberdeen; Centre of Academic Primary Care; Aberdeen UK