1 Endocrinology Section, Division of Pediatrics, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile.
2 Department of Pediatric Infectious Diseases and Immunology, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile.
3 Department of Pediatric Gastroenterology and Nutrition School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile.
4 Department of Emergency Medicine and Division of Rheumatology, Allergy, and Immunology, Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA.