A mobile intervention to reduce pain and improve health-III: protocol for a remotely delivered randomized controlled trial of physical activity for pain management in older adults with obesity and knee or hip osteoarthritis. - Fanning J; Dobson DO; Ford SA; Bennett M; Leng I; Martin AC; Merritt J; Keefe FJ; Rejeski WJ; Brooks AK (Frontiers in digital health, 2026)