1. Cardiac Intensive Care Unit, Department of Medical and Surgical Cardiology, Bambino Gesù Children’s Hospital, Rome, Italy
2. Clinical Epidemiology Laboratory, Coordinating Center GIVITI, IRCCS Pharmacological Research Institute, Mario Negri Institute, Milan, Italy
3. Immunological and Infectious Disease Unit, University Department of Pediatrics, Bambino Gesù Children’s Hospital, Rome, Italy
4. Department of Laboratories, Bambino Gesù Children’s Hospital, Rome, Italy