1. Unit of Infectious Diseases, Department of Medicine, Surgery and Pharmacy, University of Sassari, 07100 Sassari, Italy
2. Unit of Haematology, Department of Medicine, Surgery and Pharmacy, University of Sassari, 07100 Sassari, Italy
3. Unit of Dermatology, Department of Medicine, Surgery and Pharmacy, University of Sassari, 07100 Sassari, Italy
4. Unit of Respiratory Diseases, Department of Medicine, Surgery and Pharmacy, University of Sassari, 07100 Sassari, Italy
5. Unit of Internal Medicine, Department of Medicine, Surgery and Pharmacy, University of Sassari, 07100 Sassari, Italy
6. Unit of Internal Medicine, University Hospital of Sassari, 07100 Sassari, Italy
7. Unit of Oncology, University Hospital of Sassari, 07100 Sassari, Italy