1. Massachusetts General Hospital, Boston, Massachusetts, USA.
2. The Steadman Clinic, Vail, Colorado, USA.
3. Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire, USA.
4. Oregon Health & Science University, Portland, Oregon, USA.
5. Steadman Philippon Research Institute, Vail, Colorado, USA.
6. New England Patriots, Foxborough, Massachusetts, USA.