1. National Institute of Health Research School for Primary Care Research, Manchester Academic Health Science Centre, University of Manchester, Manchester, England
2. Laboratory of Hygiene, Aristotle Medical School, Aristotle University of Thessaloniki, Thessaloniki, Greece
3. Complementary and Integrated Medicine Research Unit, Primary Medical Care Aldermoor Health Centre, Southampton, England
4. National Institute of Health Research School for Primary Care Research, Manchester Academic Health Science Centre, University of Manchester, Manchester, England4Farr Institute for Health Informatics Research, Vaughan House, University of Manchester, Manchester, England
5. Research Institute, Primary Care and Health Sciences, Keele University, Staffordshire, England
6. National Institute of Health Research Greater Manchester Primary Care Patient Safety Translational Research Centre, Manchester Academic Health Science Centre, University of Manchester, Manchester, England
7. National Institute of Health Research School for Primary Care Research, Centre for Primary Care, Institute of Population Health, University of Manchester, Manchester, England