1. Shiley Center for Orthopaedic Research and Education at Scripps Clinic, La Jolla, CA, USA
2. Department of Orthopaedic Surgery, Federal University of São Paulo, São Paulo, Brazil
3. Department of Orthopaedic Surgery, Balikesir University, Balikesir, Turkey
4. Department of Orthopaedic Surgery, Scripps Clinic, La Jolla, CA, USA