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中华妇幼临床医学杂志(电子版)
High-risk factors of cardiac contractility reserve in the third trimester of high-risk pregnancy and the significance of phonocardiogram test in evaluation of pregnant women′s cardiac contractility reserve
Xiaoqing Wei, Xiao Yang
Chinese Journal of Obstetrics & Gynecology and Pediatrics(Electronic Edition) . 2019, (05): 504 -511 .  DOI: 10.3877/cma.j.issn.1673-5250.2019.05.005

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