1. Charité – Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Institute of Social Medicine, Epidemiology & Health Economics, Berlin, Germany
2. Center for Evidence Based Chinese Medicine, Beijing University of Chinese Medicine, Beijing, China
3. Department of Clinical Epidemiology & Medical Statistics, Beijing University of Chinese Medicine, Beijing, China
4. Institute for Complementary & Integrative Medicine, University of Zurich & University Hospital Zurich, Zurich, Switzerland
5. Center for Integrative Medicine, University of Maryland School of Medicine Baltimore, MD 21201, USA