Facilitating physical activity and reducing symptoms in patients with knee osteoarthritis: study protocol of a randomized controlled trial to test a theory-based PrevOP-psychological adherence program (PrevOP-PAP).
Nina KnollDiana Hilda HohlSusannah MotterJan KellerDaniela LangeDieter FelsenbergPeter MartusWolfgang ErtelRalf SchwarzerPublished in: BMC musculoskeletal disorders (2018)
German Clinical Trials Register; also available at http://apps.who.int/trialsearch/ ; registration number: DRKS00009677 ; date of registration: 26 January 2016.