Affiliation: | 1.Department of Anesthesiology and Surgery,Santa Casa de Misericórdia,Belo Horizonte,Brazil;2.Department of Surgery,Federal University of Minas Gerais,Belo Horizonte,Brazil;3.Departamento de Cirurgia, Faculdade de Medicina,Avenida Alfredo Balena, 190,Belo Horizonte,Brazil |