1. Premier Orthopedic Specialists of Tulsa, Tulsa, Oklahoma (JPD)
2. Division of Biostatistics and Epidemiology, Department of Healthcare Policy & Research, Weill Cornell Medicine, New York, New York (XM)
3. Department of Orthopedic Surgery, Cedars-Sinai Medical Center, Los Angeles, California (JG)
4. Department of Orthopaedic Foot and Ankle Surgery, Hospital for Special Surgery, New York, New York (MR, MD, JD, SE)