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

Correspondence to Maddalena Peghin, MD, PhD, Infectious and Tropical Diseases Unit, Department of Medicine and Surgery, University of Insubria, ASST-Sette Laghi, Viale Borri 57, 21100 Varese, Italy. Tel: +39 0332393389; e-mail: [email protected]