1. University of Chieti “Gabriele D'Annunzio”, Chieti, Italy.
2. Infectious Disease Unit, Pescara General Hospital, Pescara, Italy.
3. Nuclear Medicine Unit, Pescara General Hospital, Pescara, Italy.
4. Microbiology and Virology Unit, Pescara General Hospital, Pescara, Italy.
5. Department of Medicine and Aging Sciences, University of Chieti-Pescara “Gabriele D'Annunzio”, Chieti, Italy.
6. Department of Medical and Surgical Sciences, Section of Infectious Diseases, University of Bologna, S. Orsola-Malpighi Hospital, Bologna, Italy.