Affiliation: | (1) Department of Obstetrics and Gynecology, Third Affiliated Hospital of Wenzhou Medical College, Wansong Road 108, Ruian, 325200, Zhejiang, People’s Republic of China;(2) Department of Obstetrics and Gynecology, Lanzhou General Hospital, Lanzhou Military Area Command, Lanzhou, 730050, Gansu, China; |