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Mielenz, T. J., Edwards, M. C., & Callahan, L. F. (2011). Item-Response-Theory Analysis of Two Scales for Self-Efficacy for Exercise Behavior in People With Arthritis, Journal of Aging and Physical Activity, 19(3), 239-248. Retrieved Dec 13, 2019, from https://journals.humankinetics.com/view/journals/japa/19/3/article-p239.xml