1. Department of Therapeutic Research and Medicines Evaluation; Istituto Superiore di Sanità; Rome Italy
2. Division of Infectious Diseases, Department of Medicine; University of Perugia; Perugia Italy
3. Department of Infectious Diseases and Hepatology; Azienda Ospedaliera di Parma; Parma Italy
4. Infectious Diseases Unit; Ospedale Civile; Pistoia Italy
5. Division of Infectious Disease; University of Bari; Italy
6. Clinic of Infectious Diseases, Ospedali Riuniti; Marche Polytechnic University; Ancona Italy