1. Department of Physical Medicine and Rehabilitation, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
2. School of Public Health, Boston University, Boston, MA, USA.
3. Department of Wellness and Preventive Medicine, Cleveland Clinic, Cleveland, OH, USA.
4. Department of Family Medicine, Boston University School of Medicine, Boston, MA, USA.
5. National Centre for Naturopathic Medicine, Southern Cross University, Lismore, Australia.