1 Department of Epidemiology, Pre-clinical Research and Advanced Diagnostic, National Institute for Infectious Diseases Lazzaro Spallanzani IRCCS, Rome, Italy.
2 Clinical Department, National Institute for Infectious Diseases Lazzaro Spallanzani IRCCS, Rome, Italy.
3 Department of Epidemiology, Pre-clinical Research and Advanced Diagnostic, National Institute for Infectious Diseases Lazzaro Spallanzani IRCCS, Rome, Italy. Electronic address: alessandra.sacchi@inmi.it.