坐位分娩在第二产程应用的研究进展
臧瑜,蔡晓雪,李兆莹,王钰莹,刘秀芳
Journal of Hebei Medical College for Continuing Education . 2020, (6): 61 -66 .  DOI: 10.3969/j.issn.1674-490X.2020.06.010