1. Department of Orthopedic Surgery, Menlo Medical Clinic, Stanford University Medical Center, Menlo Park, California
2. Tucson Orthopaedic Institute, Tucson, Arizona
3. Division of Hand and Elbow Surgery, Georgetown University Hospital, Washington, District of Columbia
4. Department of Orthopaedic Surgery, The Ohio State University, Columbus, Ohio
5. The Orthohealing Center and The Orthobiologic Institute, Los Angeles, California
6. Orthopaedic Research Clinic, Anchorage, Alaska
7. Department of Orthopaedic Surgery, Thomas Jefferson University, Philadelphia, Pennsylvania
8. The Steadman Clinic, Vail, Colorado
9. Methodist Sports Medicine, Indianapolis, Indiana