1 Infectious Diseases Unit, Vita Salute San Raffaele University, Milan, Italy. Electronic address: raccagni.angelo@hsr.it.
2 Infectious Diseases Unit, San Raffaele Scientific Institute, Milan, Italy.
3 Laboratory of Clinical Microbiology, Virology and Bioemergencies, Ospedale Sacco, Milan, Italy.
4 Gastrointestinal Surgery Unit, Vita Salute San Raffaele University, Milan, Italy; Gastrointestinal Surgery Unit, San Raffaele Scientific Institute, Milan, Italy.
5 Infectious Diseases Unit, Vita Salute San Raffaele University, Milan, Italy.
6 Department of Pathology, Vita Salute San Raffaele University, Milan, Italy; Department of Pathology, San Raffaele Scientific Institute, Milan, Italy.
7 Laboratory of Clinical Microbiology, Virology and Bioemergencies, Ospedale Sacco, Milan, Italy; Department of Biomedical and Clinical Sciences Luigi Sacco University Hospital, University of Milan, Italy.
8 Infectious Diseases Unit, Vita Salute San Raffaele University, Milan, Italy; Infectious Diseases Unit, San Raffaele Scientific Institute, Milan, Italy.