1. Department of Psychiatry and Psychotherapy, Technische Universität München, Munich, Germany
2. Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria
3. Department of Hygiene and Epidemiology, University of Ioannina School of Medicine, Ioannina, Greece
4. Institute of Social and Preventive Medicine, University of Bern, Bern, Switzerland5Berner Institut für Hausarztmedizin, University of Bern, Bern, Switzerland6CTU Bern (Clinical Trials Unit), Department of Clinical Research, University of Bern, Bern, Switz