1. Nosocomial Infection Control Committee, Palliative Care Unit, Brazilian National Cancer Institute José Alencar Gomes da Silva, Rio de Janeiro, Brazil.
2. Department of Preventive Medicine, School of Medicine, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.
3. Infectious Diseases Service, Department of Preventive Medicine, Hospital Universitário Clementino Fraga Filho, School of Medicine, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.