1. Pediatrics Department, Hospital Sant Joan de Déu, University of Barcelona, Barcelona, Spain;
2. Neonatology Department, Hospital Sant Joan de Déu, University of Barcelona, Barcelona, Spain;
3. Diagnostic Imaging Department, Hospital Sant Joan de Déu, University of Barcelona, Barcelona, Spain;
4. Pathology Department, Hospital Sant Joan de Déu, University of Barcelona, Barcelona, Spain;
5. Pediatric Neurology Department, Hospital Sant Joan de Déu, University of Barcelona, Barcelona, Spain;
6. Gastroenterology, Hepatology and Nutrition Department, Hospital Sant Joan de Déu, University of Barcelona, Barcelona, Spain