1. Unit of Medical Statistics and Molecular Epidemiology, University Campus Bio-Medico of Rome, Italy
2. Laboratório de Flavivírus, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, Brazil
3. Department of Epidemiology, University of Florida, Gainesville, FL, USA
4. Emerging Pathogens Institute, University of Florida, Gainesville, FL, USA
5. Unit of Clinical Laboratory Science, University Campus Bio-Medico of Rome, Italy