1. Department of Public Health, Experimental and Forensic Medicine Unit of Biostatistics and Clinical Epidemiology University of Pavia Pavia Italy
2. Pediatric Emergency Room Pediatric Department University of Varese Varese Italy
3. Pediatric Arrhythmias Center IRCCS Istituto Auxologico Italiano Milan Italy
4. Epidemiology Observatory Varese Local Health Authority Varese Italy