1 Unit of Human Nutrition and Health, Department of Food Safety, Nutrition and Veterinary Public Health, Istituto Superiore di Sanità, Rome, Italy.
2 Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, UO Pediatria Media Intensità di Cura, Milan, Italy.
3 Department of Clinical Sciences and Community Health (DISCCO), University of Milano, Milan, Italy.
4 Department of Policy Analysis and Public Management, Centre for Research on Health and Social Care Management (CERGAS), Università Bocconi, Milan, Italy.