经会阴四维超声观察初产妇孕晚期盆膈裂孔与第二产程相关性分析
경회음사유초성관찰초산부잉만기분격렬공여제이산정상관성분석
Correlation Analysis between Pelvic Diaphragm Hiatus and Second Labor Stage of Primiparas during Late Pregnancy with Perineal Fourdimensional Ultrasonography Observation
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