1. Department of Health Psychology and Applied Psychodiagnostics, University of Wuppertal, Wuppertal, Germany.
2. Department of Medical Psychology and Medical Sociology, University of Leipzig, Leipzig, Germany.
3. Department of Nuclear Medicine, University of Leipzig, Leipzig, Germany.
4. Department of Biological Psychiatry, Medical University Innsbruck, Innsbruck, Austria.
5. Faculty of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, United Kingdom.
6. Rehabilitation Clinic, Bad Oexen, Germany.