1. Institute of Medical Psychology and Medical Sociology, University Hospital of RWTH Aachen University, Germany,
2. Institute of Medical Psychology and Medical Sociology, University Hospital of RWTH Aachen University, Germany
3. Institute of Psychology, University of Education, Freiburg, Germany
4. Psychiatry - Psychotherapy - Psychosomatics - Preventive Medicine, LWL-University Hospital, Ruhr-University Bochum, Germany