1. Metabolic and Autoimmune Liver Disease Unit; Bambino Gesù Children's Hospital; Rome; Italy
2. Department of Pediatrics and European Laboratory for the Investigation of Food Induced Diseases (ELFID); University of Naples ‘Federico II’; Naples; Italy
3. Azienda Sanitaria Locale Milano 2; Milano; Italy
4. Clinical Epidemiology Unit; Liver Research Center; Basovizza; Trieste; Italy