Bennell, K. L., Ahamed, Y., Jull, G., Bryant, C., Hunt, M. A., Forbes, A. B., Kasza, J., Akram, M., Metcalf, B., Harris, A., Egerton, T., Kenardy, J. A., Nicholas, M. K., Keefe, F. J. Physical Therapist-Delivered Pain Coping Skills Training and Exercise for Knee Osteoarthritis: Randomized Controlled Trial. Arthritis care & research 2016; 5: 590-602