Velásquez Hurtado, José Enrique, et al. “Neonatal Mortality, Analysis of Surveillance Registers, and Neonatal Medical Histories of 2011 in Huanuco and Ucayali, Peru”. Revista Peruana De Medicina Experimental Y Salud Pública, vol. 31, no. 2, July 2014, https://doi.org/10.17843/rpmesp.2014.312.39.