Affiliation: | 1. University of Groningen, University Medical Centre Groningen, Department of Psychiatry, P.O. Box 30.011, 9700 RB Groningen, The Netherlands;2. University of Groningen, University Medical Centre Groningen, Department of General Practice, P.O. Box 30.011, 9700 RB Groningen, The Netherlands;3. University of Groningen, University Medical Centre Groningen, Department of Internal Medicine, P.O. Box 30.011, 9700 RB Groningen, The Netherlands |