1. Epidemiology Unit, Azienda USL-IRCCS of Reggio Emilia, Reggio Emilia, Italy
2. Public Health Unit, Azienda USL-IRCCS di Reggio Emilia, Reggio Emilia, Italy
3. Unit of Clinical Immunology, Allergy and Advanced Biotechnologies, Azienda Unità Sanitaria Locale-IRCCS di Reggio Emilia, Italy
4. Infectious Disease Unit, Azienda USL-IRCCS di Reggio Emilia, Reggio Emilia, Italy
5. National Institute for Cardiovascular Research, Bologna, Italy
6. Department of Medical and Surgical Sciences for Children and Adults, University of Modena and Reggio Emilia School of Medicine, Modena, Italy
7. Dipartimento Malattie Infettive, Istituto Superiore di Sanità, Rome, Italy