1. Edge Hill University; Postgraduate Medical Institute; St Helens Road Ormskirk Lancashire UK L39 4QP
2. University of Oxford; Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences (NDORMS); Oxford UK
3. Lancaster University; Medical School; Lancaster UK
4. St George's, University of London; Cochrane Airways, Population Health Research Institute; London UK SW17 0RE
5. AZ Nikolaas; Sint-Niklaas Belgium
6. UZ Leuven; Leuven Belgium
7. University of Dundee, Ninewells Hospital and Medical School; Dundee UK
8. University of Cumbria; Medical and Sport Sciences; Lancaster UK