Computer Science Department, Federal University of São Carlos, Rod. Washington Luís, Km 235, São Carlos, 21040-900, Brazil.|LBCS-IOC, Oswaldo Cruz Foundation, Av Brasil 4365, Rio de Janeiro, 21040-900, Brazil.|LBCS-IOC, Oswaldo Cruz Foundation, Av Brasil 4365, Rio de Janeiro, 21040-900, Brazil.|Computer Science Department, Federal University of São Carlos, Rod. Washington Luís, Km 235, São Carlos, 21040-900, Brazil.|PROCC, Oswaldo Cruz Foundation, Av. Brasil 4365, Rio de Janeiro, 21040-900, Brazil. fabricio.silva@fiocruz.br.