1. March of Dimes, PMNCH, Save the Children, WHO. Born Too Soon: The Global Action Report on Preterm Birth;WHO,2012
2. Births: final data for 2013;Martin;Natl Vital Stat Rep,2015
3. Between-hospital variation in treatment and outcomes in extremely preterm infants;Rysavy;N Engl J Med,2015
4. PeriStats: March of Dimes Perinatal Data Center/Quality Analytic Services Special Care Nursery Admissions. Accessed 17 May 2015.
5. Epidemiology and treatment of painful procedures in neonates in intensive care units;Carbajal;JAMA,2008