1. Altrecht Mental Health Care, 3720 AA Bilthoven, The Netherlands
2. Faculty Religion, Culture and Society, University of Groningen, 9712 CP Groningen, The Netherlands
3. University of Groningen, University Medical Center Groningen, University Center for Psychiatry, Rob Giel Research Center, 9713 GZ Groningen, The Netherlands
4. Department of Research Methods and Statistics in Psychology, Witten/Herdecke University, 58455 Witten, Germany
5. Department of Psychosomatic Medicine and Psychotherapy, University Hospital Rechts der Isar, Technical University of Munich, 80333 Munich, Germany
6. Institute of Integrative Medicine, Witten/Herdecke University, 58448 Herdecke, Germany
7. Center for Integrative Psychiatry Lentis, 9725 AG Groningen, The Netherlands