1. Department of Internal and Integrative Medicine, Evang. Kliniken Essen-Mitte, Faculty of Medicine, University of Duisburg-Essen, Essen, Germany.
2. National Centre for Naturopathic Medicine, Southern Cross University, Lismore, Australia.
3. Australian Research Centre in Complementary and Integrative Medicine (ARCCIM), Faculty of Health, University of Technology Sydney, Sydney, Australia.
4. Harris College of Nursing and Health Sciences, Texas Christian University, Fort Worth, TX, USA.