1. Australian Centre for Public and Population Health Research, Faculty of Health; University of Technology Sydney; Sydney New South Wales Australia
2. Department of Internal and Integrative Medicine, Kliniken Essen-Mitte, Faculty of Medicine; University Duisburg-Essen; Essen Germany
3. Endeavour College of Natural Health; Sydney New South Wales Australia
4. Oxford Institute of Nursing and Allied Health Research, Faculty of Health and Life Sciences; Oxford Brookes University; Oxford United Kingdom