1. Faculdade Israelita de Ciencias da Saude Albert Einstein and Hospital Israelita Albert Einstein; Orthopaedic Department and School of Medicine; Av. Albert Einstein, 627/701 São Paulo São Paulo Brazil CEP 05651-901
2. Cabrini Institute and Department of Epidemiology and Preventive Medicine, School of Public Health and Preventive Medicine, Monash University; Monash Department of Clinical Epidemiology; Melbourne Australia
3. Universidade Federal de São Paulo; Department of Orthopaedics and Traumatology; Rua Borges Lagoa, 783-5th Floor São Paulo São Paulo Brazil 04038-032