STepped exercise program for patients with knee OsteoArthritis (STEP-KOA): protocol for a randomized controlled trial by Kelli D. Allen, Dennis Bongiorni, Kevin Caves, Cynthia J. Coffman, Theresa A. Floegel, Heather M. Greysen, Katherine S. Hall, Bryan Heiderscheit, Helen M. Hoenig, Kim M. Huffman, Miriam C. Morey, Shalini Ramasunder, Herbert Severson, Battista Smith, Courtney Van Houtven, Sandra Woolson

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