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Welch, W. A., Swartz, A.M. , Cho, C. C., & Strath, S. J. (2016). Accuracy of Direct Observation to Assess Physical Activity in Older Adults, Journal of Aging and Physical Activity, 24(4), 583-590. Retrieved Dec 10, 2019, from https://journals.humankinetics.com/view/journals/japa/24/4/article-p583.xml