1. Geriatric Unit, Azienda Sanitaria Universitaria Giuliano Isontina, Trieste, Italy
2. Postgraduate School in Geriatrics, Department of Medical, Surgical and Health Sciences, University of Trieste, Trieste, Italy
3. Microbiology and Virology Laboratory, Azienda Sanitaria Friuli Occidentale, Pordenone, Italy
4. Department of Medical, Surgical and Health Sciences, University of Trieste, Trieste, Italy
5. SS Endocrinologia, UCO Medicina Clinica, Cattinara University Hospital, Trieste, Italy