Mortality for Newborns of Birthweight less Than 1500 g in Spanish Neonatal Units (2002-2005) - Moro, Manuel; Figueras-Aloy, Josep; Fernández, Cristina; Doménech, Eduardo; Jiménez, Rafael; Pérez-Rodríguez, Jesús; Pérez-Sheriff, Vicente; Quero, José; Roqués, Vicente (American Journal of Perinatology, 2007)