aInfectious Diseases Unit, San Martino Policlinico Hospital—IRCCS for Oncology and Neurosciences

bDepartment of Health Sciences (DISSAL), University of Genoa

cDepartment of Pulmonology, Azienda Sanitaria Universitaria Integrata di Udine, Udine

dInfectious and Tropical Diseases Unit, Department of Medicine and Surgery, University of Insubria-ASST-Sette Laghi, Varese, Italy

Correspondence to Antonio Vena, Clinica Malattie Infettive, Ospedale Policlinico San Martino-IRCCS, Genova, Largo R. Benzi 10, 16132 Genova-, Italy. Tel: +390105554658; e-mail: [email protected]; Matteo Bassetti, Clinica Malattie Infettive, Ospedale Policlinico San Martino-IRCCS, Largo R. Benzi 10, 16132 Genova, Italy. Tel: +390105554658; e-mail: [email protected]