Mechanism evaluation of a lifestyle intervention for patients with musculoskeletal pain who are overweight or obese: protocol for a causal mediation analysis

- Lee, Hopin; Wiggers, John; Robson, Emma K.; McAuley, James H.; Williams, Christopher M.; Kamper, Steven J.; Williams, Amanda; O'Brien, Kate M.; Hodder, Rebecca K.; Wolfenden, Luke; Yoong, Sze Lin; Campbell, Elizabeth; Haskins, Robin