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Trends in live births in the past 20 years in Zhengzhou, Ch..:

HAN, WEI ; SONG, JIANGANG ; LIU, AIQING...
Acta Obstetricia et Gynecologica Scandinavica.  90 (2011)  4 - p. 332-337 , 2011
Link: https://doi.org/10.1111/j.1600-0412.2010.01065.x