Cohort profile: Oxford Pain, Activity and Lifestyle (OPAL) Study, a prospective cohort study of older adults in England by Sarah E Lamb, Christian D Mallen, M Watson, Julie Bruce, S Dutton, S Petrou, Lesley Ward, Maria T Sanchez Santos, Esther Williamson, Angela Garrett, Alana Morris, O Conway, F Darton, D Hagan, D Haywood, A Hewitt, I Marian, L Nevay, P Nicolson, M Slark, K Vadher, E Williamson, N Arden, K Barker, G Collins, J Fairbank, J Fitch, D French, F Griffiths, Z Hanson, C Hutchinson

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