1. Physiotherapy Department, Southampton University Hospitals National Health Service Trust, Southampton, Southampton, UK.
2. School of Health Professions and Rehabilitation Sciences, University of Southampton, Southampton, UK.
3. University of Southampton, University of Westminster, and Complementary Medicine Research Unit, Primary Medical Care Aldermoor Health Centre, Southampton, UK.
4. Research and Development Support Unit, Southampton University Hospitals National Health Service Trust, Southampton, UK.