Secular Trends of Preterm Birth Rate in Primiparous Women by Matermal Age: 1997~1999, 2011~2013 Singleton Birth Certificated Data of Korea
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J Korean Soc Matern Child Health. 2015;19(2):296-303.   Published online 2015 Jul 31     DOI: https://doi.org/10.21896/jksmch.2015.19.2.296
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