Direct medical costs of neonatal respiratory distress syndrome in two specialized public hospitals in Mexico. - Martínez-Valverde, Silvia; Castro-Ríos, Angélica; Salinas-Escudero, Guillermo; Villasis-Keever, Miguel A.; Garduño-Espinosa, Juan; Muñoz-Hernández, Onofre (Salud Pública de México, 2014)