1 Division of Emergency Medicine, Department of Internal Medicine, Ribeirão Preto School of Medicine, São Paulo University, Rua Bernardino de Campos, 1000 Ribeirão Preto, São Paulo, Brazil.
2 Division of Emergency Medicine, Department of Internal Medicine, Ribeirão Preto School of Medicine, São Paulo University, Rua Bernardino de Campos, 1000 Ribeirão Preto, São Paulo, Brazil. Electronic address: chmiranda@fmrp.usp.br.