1. Department of Orthopedics, Sunnybrook Health Sciences Center, Toronto, Ontario, Canada
2. Department of Orthopedics, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil
3. Division of Orthopedics and Traumatology, Hospital Miguel Couto, Rio de Janeiro, Brazil
4. Department of Orthopedics, Missouri Orthopedic Institute, University of Missouri, Columbia, Missouri