1. Department Quality of Life, Spirituality and Coping, Center of Integrative Medicine, Faculty of Health, Witten/Herdecke University, 58313 Herdecke, Germany
2. Department of Internal and Complementary Medicine, Immanuel Hospital Berlin and Institute of Social Medicine, Epidemiology & Health Economics, Charité-University Medical Center, 14109 Berlin, Germany
3. Division of Sleep Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA 02115, USA
4. Director of Research, Patanjali Research Foundation, Haridwar 249405, India
5. Group Health Research Institute, Group Health Cooperative, Seattle, WA 98101, USA