Epidemiological characterization of congenital heart disease at different altitudes in Ecuador: a four-year retrospective study in a pediatric referral hospital - Izquierdo-Condoy, Juan S.; Arias-Rodríguez, Fabian D.; Díaz-Chamba, Walter I.; Mena-Noroña, Diego A.; Toaquiza, Lizbeth Cueva; Espín-Sambache, Beanjuly; Valdivieso-Andrade, Emilia J.; Cangas-Isacaz, Amanda; García-Cañarte, Susana; Rubio-Niera, Mario; Ortiz-Prado, Esteban (Frontiers in Public Health, 2025)