1 Infectious Diseases I Unit, Fondazione IRCCS San Matteo, Pavia, Italy.
2 Infectious and Tropical Diseases Unit, Azienda Ospedaliero-Universitaria Senese, Siena, Italy.
3 Direzione Medica di Presidio e Risk Management, Fondazione IRCCS San Matteo, Pavia, Italy.
4 Infectious Diseases I Unit, Fondazione IRCCS San Matteo, Pavia, Italy; Department of Medical, Surgical, Diagnostic and Paediatric Science, University of Pavia, Pavia, Italy. Electronic address: [email protected].