Application of Controlling Fetal Head Delivery Speed Based on Perineal Central Tendon Tension as a Standard in Primiparous Women Undergoing Natural Delivery
QIU Tianshuang, XIAO Dan, LYU Chunxiu, LI Muzi, XIAO Yiran
First-author's address: Department of Gynaecology and Obstetrics, Beijing Huairou Hospital, Beijing 101400, China