Dr. Miguel Ángel Guagnelli obtained an MD from Universidad Nacional Autónoma de México (UNAM) and specialized in Pediatrics at “La Raza” National Medical Center. He has a Master´s Degree in Pediatric Endocrinology from Universitat Autònoma de Barcelonaand a Master´s Degree in Clinical Epidemiologý from UNAM. He is currently working on a PhD project. Dr. Guagnelli teaches Clinical Epidemiology in the same institution in undergraduate and postgraduate levels and has published papers about vitamin D, bone health in children and adults.