1. Philippines Statistics Authority . Vital Statistics 2018 - Preliminary Counts of Births, Marriages and Deaths. Republic of the Philippines, 2019. https://psa.gov.ph/civilregistration/vital-statistics-2018-preliminary-counts-births-marriages-and-deaths
2. United Nations Inter-agency Group for Child Mortality Estimation (UN IGME) . Levels & Trends in Child Mortality: Report 2020, Estimates developed by the United Nations Inter-agency Group for Child Mortality Estimation. New York: United Nations Children’s Fund, 2020.
3. World Health Organization . Global Health Observatory Data Repository [website]. Geneva: World Health Organization, 2019. https://apps.who.int/gho/data/view.main.ghe3002015-CH10?lang=en
4. 4 million neonatal deaths: when? where? why?;Lawn;The Lancet,2005
5. Global, regional, and national estimates of levels of preterm birth in 2014: a systematic review and modelling analysis;Chawanpaiboon;Lancet Glob Health,2019