1 University of Toronto, Dalla Lana School of Public Health, Toronto, Canada; Hospital Israelita Albert Einstein, Departamento de Anestesia, São Paulo, SP, Brazil; Takaoka Anestesia, São Paulo, SP, Brazil. Electronic address: fabio.vasconcelos@mail.utoronto.ca.
2 Takaoka Anestesia, São Paulo, SP, Brazil; Hospital Israelita Albert Einstein, Departamento de Anestesia, São Paulo, SP, Brazil.