1 University of Witten/Herdecke, Institute for Integrative Medicine, Herdecke, Germany.
2 Institute for Social Medicine, Epidemiology and Health Economics, Charité Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt Universität zu Berlin, Berlin, Germany. michael.teut@charite.de.
3 Change Health Science Institute, Berlin, Germany.