1. Department of Orthopedic Surgery, University of Pennsylvania, Philadelphia, PA 19104, USA
2. 3400 Spruce St, 2 Silverstein, Philadelphia, PA 19146, USA
3. Hospital for Special Surgery, New York, NY 10021, USA
4. Robert A. Chase Hand and Upper Limb Center, Stanford University Hospitals and Clinics, Palo Alto, CA 94304, USA