Gutiérrez, M. E., G. Matzumura, D. Olivos, C. Loza, F. Rivera, and V. Webb. “Mortality Associated Factors in VLBW Preterm Newborns Between 2002-2011 in a Peruvian Hospital”. International Journal of Pediatrics and Child Health, vol. 4, no. 2, Sept. 2016, pp. 89-97, doi:10.12974/2311-8687.2016.04.02.4.