1 Department of Anaesthesia, Hospital do Câncer II, Rio de Janeiro, Brazil. Electronic address: brunoaraujomed@yahoo.com.br.
2 Clinical Research Division, National Cancer Institute of Brazil (INCA), Rio de Janeiro, Brazil.
3 Clinical Research Division, National Cancer Institute of Brazil (INCA), Rio de Janeiro, Brazil; Neurology Post Graduation Program, Federal University of the State of Rio de Janeiro (UNIRIO), Rio de Janeiro, Brazil.