1. Clinic for Medical Oncology and Hematology, University Hospital Zurich, University of Zurich, Zurich, Switzerland.
2. Institute for Complementary and Integrative Medicine, University Hospital Zurich, University of Zurich, Zurich, Switzerland.
3. Institute for Social Medicine, Epidemiology and Health Economics, Charité – Universitätsmedizin Berlin, Berlin, Germany.
4. Center for Integrative Medicine, University of Maryland School of Medicine, Baltimore, MD, USA.