Chang, Alison H Association between Pre-Intervention Physical Activity Level and Treatment Response to Exercise Therapy in Persons with Knee Osteoarthritis - An Exploratory Study. [electronic resource] - ACR open rheumatology Apr 2019 - 104-112 p. digital Publication Type: Journal Article ISSN: 2578-5745 Standard No.: 10.1002/acr2.1013 doi