1. Department of Orthopaedics, University of Utah School of Medicine, Salt Lake City, Utah
2. Shoulder and Elbow Service, Department of Orthopaedic Surgery, Washington University School of Medicine, Barnes-Jewish Hospital, St Louis, Missouri
3. Mallinckrodt Institute of Radiology, Washington University School of Medicine, Barnes-Jewish Hospital, St Louis, Missouri
4. Division of Biostatistics, Washington University School of Medicine, St Louis, Missouri