Velásquez Hurtado, J.E. et al. 2014. 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. 31, 2 (Jul. 2014). DOI:https://doi.org/10.17843/rpmesp.2014.312.39.