1. Karl Landsteiner Institute, Institute for Outpatient Rehabilitation Research, Vienna, Austria;
2. Department of Psychology, Karl Landsteiner University of Health Sciences, Krems, Austria;
3. Essen University Hospital, Institute of Medical Psychology and Behavioral Immunobiology, Essen, Germany;
4. Department of Psychology, Harvard University, Cambridge, MA, USA;
5. Department of Physical Medicine and Rehabilitation, Medical University Vienna, Vienna, Austria