1. Department of Orthopaedic Surgery, Stanford University, Redwood City, California, USA
2. American Sports Medicine Institute, Birmingham, Alabama, USA
3. Department of Orthopaedic Surgery, University of Michigan Medical School, Ann Arbor, Michigan, USA
4. Rothman Institute at Thomas Jefferson University, Philadelphia, Pennsylvania, USA
5. Sports Medicine and Shoulder Service, Hospital for Special Surgery, New York, New York, USA