1. Shoulder and Elbow Institute, Knoxville Orthopaedic Clinic, Knoxville, Tennessee
2. Vanderbilt University Medical Center, Health Services Research Center, Nashville, Tennessee
3. Department of Orthopaedic Surgery, Washington University School of Medicine, St. Louis, Missouri
4. University of Iowa, Iowa City, Iowa
5. Vanderbilt Orthopaedic Institute, Nashville, Tennessee
6. The University of Colorado, Boulder, Colorado
7. UCSF Sports Medicine, San Francisco, California
8. The Ohio State University, Columbus, Ohio