1. Pediatric Surgery Department, Hospital Universitari Germans Trias i Pujol, 08916 Badalona, Spain
2. Department of Health Sciences, Campus Alcorcón, University Rey Juan Carlos (URJC), 28922 Madrid, Spain
3. Fundació Institut Germans Trias i Pujol, 08916 Barcelona, Spain
4. Department of Biochemistry and Physiology, School of Pharmacy and Food Sciences, Institut de Biomedicina de la Universitat de Barcelona (IBUB), Universitat de Barcelona, 08028 Barcelona, Spain
5. Pediatric Endocrinology Unit, Pediatric Department, Hospital Universitari Germans Trias i Pujol, 08916 Badalona, Spain
6. Pediatric Nurse, Hospital Universitari Germans Trias i Pujol, 08916 Badalona, Spain
7. Endocrinology Department, Hospital Universitari Germans Trias i Pujol, 08916 Badalona, Spain
8. General Surgery Department, Hospital Universitari Germans Trias i Pujol, 08916 Badalona, Spain
9. NIHR BRC Core Metabolomics and Lipidomics Laboratory, Metabolic Research Laboratories, Institute of Metabolic Science, University of Cambridge, Cambridge CB2 1GG, UK
10. Biochemistry and Molecular Biomedicine Department, Institut de Biomedicina de la Universitat de Barcelona (IBUB), 08028 Barcelona, Spain
11. Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y Nutrición (CIBERobn), 28029 Madrid, Spain
12. Institute of Metabolic Science, Addenbrooke’s Hospital, University of Cambridge, Cambridge CB2 1GG, UK
13. Institut de Recerca Hospital de la Santa Creu i Sant Pau, 08041 Barcelona, Spain