1. Hospital Israelita Albert Einstein; Orthopaedic and Trauma Department; Av. Albert Einstein, 627/701 São Paulo Sao Paulo Brazil CEP 05651-901
2. Department of Epidemiology and Preventive Medicine, School of Public Health and Preventive Medicine, Monash University; Monash Department of Clinical Epidemiology, Cabrini Hospital; Suite 41, Cabrini Medical Centre 183 Wattletree Road Malvern Victoria Australia 3144
3. University of Birmingham; Public Health, Epidemiology and Biostatistics; Edgbaston Birmingham UK B15 2TT
4. Teesside University; Health and Social Care Institute; Middlesbrough Tees Valley UK TS1 3BA
5. Universidade Federal de São Paulo; Department of Orthopaedics and Traumatology; Rua Borges Lagoa, 783-5th Floor São Paulo São Paulo Brazil