1. Academic Medical Centre, Department of Ambulatory Psychiatry, Meibergdreef 9, 1105 AZ, Amsterdam ZO, The Netherlands
2. St. Andrew's Hospital, Billing Road, Northampton NN1 5DG, UK
3. Institute of Social Medicine, University of Copenhagen, Panum Institute, Blegdamsvej 3, DK 2200, Copenhagen N., Denmark
4. Faculty of Educational Sciences, Grote Bickerstraat 72, 1013 KS, Amsterdam, The Netherlands
5. Social and Community Psychiatry Unit, Institute of Psychiatry, De Crespigny Park, London SE5 8AF, UK