1. Touro University California, College of Osteopathic Medicine, Vallejo, California, USA
2. Shiley Center for Orthopaedic Research and Education at Scripps Clinic, La Jolla, California, USA
3. Department of Orthopedic Surgery, Saint Louis University, Saint Louis, MO, USA
4. Department of Orthopedic Surgery, Scripps Clinic, La Jolla, California, USA