Drupal-Bibcite0<style face="normal" font="default" size="100%">Mechanism evaluation of a lifestyle intervention for patients with musculoskeletal pain who are overweight or obese: protocol for a causal mediation analysis.</style><style face="normal" font="default" size="100%">Mechanism evaluation of a lifestyle intervention for patients with musculoskeletal pain who are overweight or obese: protocol for a causal mediation analysis.</style>