Department of Obstetrics and Gynecology, Zigong Third People's Hospital in Sichuan Province, Zigong City, Sichuan Province, 643020;
Department of Obstetrics and Gynecology, Zigong Third People's Hospital in Sichuan Province, Zigong City, Sichuan Province, 643020;
Department of Obstetrics and Gynecology, Zigong Third People's Hospital in Sichuan Province, Zigong City, Sichuan Province, 643020;