中国计划生育学杂志
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早孕期胎儿心脏二维超声成像影响因素探讨
山东省莱州市妇幼保健院(261400)
Study on the influencing factors of two-dimensional ultrasound imaging of fetal heart during the first trimester of pregnancy
Laizhou Maternal and Child Health Care Hospital, Shandong Province, 261400