^aDivision of HIV, Infectious Diseases, and Global Medicine; Department of Medicine; University of California, San Francisco (UCSF), USA

^bIII Division of Infectious Diseases, Department of Biomedical and Clinical Sciences (DIBIC), Luigi Sacco University Hospital, University of Milan, Italy

Correspondence to Agostino Riva, and Monica Gandhi, MD, Universita degli Studi di Milano, Milano, Italy. E-mail: [email protected]; [email protected]