1. Department of Internal Medicine II, Center for Complementary Medicine, Freiburg University Hospital Faculty of Medicine, University of Freiburg, Freiburg, Germany (MAS)
2. Interdisciplinary Medical Intensive Care (IMIT), Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg im Breisgau, Germany (MB)
3. Institute of Social Medicine, Epidemiology and Health Economics, Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany (MJ)
4. Department of Internal Medicine and Nature-Based Therapies, Immanuel Hospital Berlin, Berlin, Germany (MJ)