Gene Polymorphisms of Nitric Oxide Synthase in Endothelial Cells of Umbilical Cord Vessels and Major Complications among Han Premature Infants of ≤34 Weeks' Gestational Age　
CHANG Shao-hong1*，LUAN Bin2，ZHANG Wei-xing1
Chinese General Practice . 2018, (18): 2222 -2226 .  DOI: 10.3969/j.issn.1007-9572.2018.00.159

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