1 Intermediate Pediatric Care Unit, Fondazione IRCCS Cà Granda, Ospedale Maggiore Policlinico, Milano - Department of Clinical Sciences and Community Health- DISCCO, University of Milano, Via della Commenda 9 , 20122 Milano, Italy. Electronic address: carlo.agostoni@unimi.it.
2 Department of Nutrition, Exercise and Sports, University of Copenhagen, Rolighedvej 26, 1958 Frederiksberg C, Denmark. Electronic address: ll@nexs.ku.dk.