1Paying attention to understanding the high risk factors of preterm birth through inquiring about medical history at peripregnency and ear-ly pregnancySUN Wen, CHEN Dun-jin134-1362Argument about measurement of cervical length in middle pregnancyCHEN Qian137-1393Research progress in the prevention of preterm birth caused by cervical shortening with vaginal progesteroneLIU Yi-lin, LI Jia-po, QIAO Chong139-1434Indications and surgical methods of cervical cer-clage for prevention of preterm birthCHEN Han-qing, DENG Song-qing, WANG Zi-lian144-1485Problems related to emergency cervical cerclage to prevent preterm deliveryDAI Yi-min148-1526Research progress in clinical application of com-mon tocolytic drugsZHOU Le, LIU Xing-hui153-1577Prevention of severe central nervous system complications in premature infants by magne-sium sulfate:current situationLIAN Yan, WANG Xie-tong157-1608Application strategy of antenatal corticosteroid at different gestational ageZHOU Shu-wei, WANG Lan, QI Hong-bo160-1659Comparison of the efficacy of two surgical procedures in the treatment of CSD-induced prolonged menstrual period after cesarean sectionZHANG Zhi-qin, HUANG Xiu-min, HUANG Li-li, ZHOU Xiao-feng205-20810Clinical study of twin pregnancy anemia in ChinaXIE Fang, LIU Cai-xia, LIU Jing-yi, LI Jie, YANG Xue, YU Wen-qian, HUANG Hai-long, HOU Jia-ru, ZHAO Yan, WEI Jun209-21211Study on the effect of high-intensity focused ultrasound and tumor-bearing observation on perinatal indicators of patients with uterine fibroidsLIU Xiao-fang, LUO Shuang, LIN Fang, HUANG Guo-hua, MU Yan, HE Jia, HU Li-na213-21712Clinical study of uterine artery embolization combined with methotrexate in the treatment of cesarean scar pregnancyFAN Zhi-wen, XUE Min218-22013Analysis of prognosis of 172 patients with cervical cerclageCHEN Guo-qing, LI Xiao-dong, ZHOU Ying, JIANG Jin-na, LIN Ya-zhen, WU Qin221-22514Analysis of vaginal microecological characteristics and their correlation with human papilloma virus infection in gynecological outpatientsWANG He-shu-qi, BAI Hui-hui, LIU Zhao-hui226-23015Study on the effect and mechanism of ketones in Honghe Fujie lotion in the treatment of vulvovaginal candidiasisCHEN Dan-li, YANG Jian-jun, REN Ling-xuan, LIN Rong, PEI Mei-li231-235 