1. Department of Orthopedic Surgery, Mayo Clinic, Rochester, MN, USA
2. Department of Orthopaedics and Rehabilitation, Oregon Health & Sciences University, Portland, OR, USA
3. Tri-State Specialists, Sioux City, IA, USA
4. Department of Orthopaedic Surgery, Duke University School of Medicine, Durham, NC, USA
5. Orthopaedic Specialty Institute / Hoag Orthopedic Institute, Orange, CA, USA
6. Clinica Alemana, Universidad del Desarrollo, Las Condes, Santiago, Chile