1. Births: provisional data for 2017;Hamilton,2018
2. Pregnancies, births, and poverty;Burki;Lancet Child Adolesc. Health,2018
3. R. Schiller, I.H. Jsselstijn, A. Hoskote, T. White, F. Verhulst, A. van Heijst, D. Tibboel,Memory deficits following neonatal critical illness: a common neurodevelopmental pathway. Lancet Child Adolesc. Health.
4. Racial and ethnic differences in preterm birth: a complex, multifactorial problem;Manuck;Semin. Perinatol.,2017
5. S.O. Nwhator, Association between a-MMP-8 Chairside Test for Chronic Periodontitis and Selected Reproductive Health Parameters. (Ph.D. doctoral dissertation). University of Helsinki, Helsinki, Finland. Retrieved fromhttp://urn.fi/URN:ISBN:978-951-51-4058-6.