Center for Evidence-based Practice, University of Pennsylvania Health System, Philadelphia, Pennsylvania. Center for Evidence-based Practice, University of Pennsylvania Health System, Philadelphia, Pennsylvania. Department of Orthopaedic Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania. Department of Orthopaedic Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania. Department of Orthopaedic Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania. Center for Evidence-based Practice, University of Pennsylvania Health System, Philadelphia, Pennsylvania; Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.