1. Department of Psychosomatic Medicine, Center for Internal Medicine and Dermatology; Charité - Universitätsmedizin Berlin; Berlin Germany
2. Population Health Strategic Research Centre, School of Health and Social Development; Deakin University; Burwood VIC 3125 Australia
3. Department of Psychosomatic Medicine; Justus Liebig University (JLU); Giessen Germany
4. Department of Psychosomatic Medicine; Philipps University Marburg; Marburg Germany
5. Psychoneuroimmunology Laboratory, Department of Psychosomatic Medicine; Justus Liebig University (JLU); Giessen Germany
6. Department of Dermatology; Philipps University Marburg; Marburg Germany
7. Quantitative Health Sciences, Outcomes Measurement Science; University of Massachusetts Medical School; Worcester MA USA