1. University of Washington Department of Orthopaedics and Sports Medicine, 1959 N.E. Pacific St., Box 356500 Seattle, WA 98195, USA
2. School of Medicine at University of California at Davis, Sacramento, CA 95817, USA
3. Department of Orthopaedic Surgery, University of California at Davis, 4860 Y Street, Suite 3800, Sacramento, CA 95829, USA
4. Shriners Hospital for Children, Northern California, 2425 Stockton Blvd., Sacramento, CA 95817, USA