Physical therapy vs. internet-based exercise training (PATH-IN) for patients with knee osteoarthritis: study protocol of a randomized controlled trial by Williams, Quinn I, Gunn, Alexander H, Beaulieu, John E, Benas, Bernadette C, Buley, Bruce, Callahan, Leigh F, Cantrell, John, Genova, Andrew P, Golightly, Yvonne M, Goode, Adam P, Gridley, Christopher I, Gross, Michael T, Heiderscheit, Bryan C, Hill, Carla H, Huffman, Kim M, Kline, Aaron, Schwartz, Todd A, Allen, Kelli D

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