1. Department of Research and Development, University of Teacher Education Bern, 3012 Bern, Switzerland
2. Clinical Psychology and Psychotherapy, Department of Psychology, University of Bern, 3012 Bern, Switzerland
3. Psychosomatic Medicine, Department of Neurology, Inselspital, Bern University Hospital, 3010 Bern, Switzerland
4. Clinica Holistica Engiadina, Centre for Stress-Related Disorders, 7542 Susch, Switzerland
5. Clinical Psychology and Psychotherapy, Department of Psychology, University of Zurich, 8050 Zurich, Switzerland