1. Department of Psychology; University of Fribourg; Fribourg Switzerland
2. Institute of Psychology; University of Lausanne; Lausanne Switzerland
3. Integrated Research and Treatment Center of Adiposity Diseases; University of Leipzig Medical Center; Leipzig Germany
4. Department of Psychology, Division of Clinical Psychology and Epidemiology; University of Basel; Basel Switzerland
5. Department of Medical Psychology and Medical Sociology; University of Leipzig Medical Center; Leipzig Germany