KArAT (Knee Arthroplasty Activity Trial): Rationale and design features of a multicenter randomized controlled trial by Elena Losina, Jamie E. Collins, Mahima Kumara, Linda Ehrlich-Jones, Maame Opare-Addo, Clare Safran-Norton, Neil A. Segal, Lauren M. Mitchell, Paul T. Kopp, Faith Selzer, Hanna Mass, Michael Paskewicz, Rowland W. Chang, Dorothy Dunlop, Antonia F. Chen, Samuel Lerner, Samantha Chin, Christine Pellegrini, Jeffrey N. Katz

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