aCentre for Statistics in Medicine, Centre for Rehabilitation Research in Oxford, Nuffield Department of Orthopaedics Rheumatology and Musculoskeletal Sciences (NDORMS), University of Oxford, Oxford, United Kingdom

bSchool of Medicine and Public Health, University of Newcastle, New South Wales, Australia

cPain Research Education and Management Program, Neuroscience Research Australia, Sydney, Australia

dPrince of Wales Clinical School, University of New South Wales, Sydney, Australia

eNew College Village, University of New South Wales, Sydney, Australia

fHealth Behaviour Change Research Group, School of Psychology, Arts Millennium Building, National University of Ireland Galway, Ireland

gUniversity of South Australia, Adelaide, Australia

*Corresponding author. Address: Nuffield Department of Orthopaedics Rheumatology and Musculoskeletal Sciences, University of Oxford, Windmill Rd, Headington, Oxford OX3 7LD, United Kingdom. E-mail address: hopin.lee@ndorms.ox.ac.uk (H. Lee).

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