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. Department of Orthopedics, Missouri Orthopedic Institute, University of Missouri, Columbia, Missouri
4. Serviço de Ortopedia e Traumatologia, Hospital Municipal Miguel Couto, Rio de Janeiro, Brazil