1. Department of Social Medicine Ribeirão Preto Medical School, University of São Paulo Ribeirão Preto Brazil
2. Department of Orthopedics and Anesthesiology Hospital das Clínicas at Ribeirão Preto Medical School, University of São Paulo Ribeirão Preto Brazil
3. Department of Orthopedics and Anesthesiology Ribeirão Preto Medical School University of São Paulo Ribeirão Preto Brazil