Charité- Universitätsmedizin Berlin, Corporate Member of Freie UniVersität Berlin, Humboldt-Universität zu Berlin, And Berlin Institute of Health, Institute for Social Medicine, Epidemiology and Health Economics, Berlin, Germany; Institute for Complementary and Integrative Medicine, University Hospital Zurich and University Zurich, Zurich, Switzerland. Electronic address: daniel.pach@charite.de.