Department of Gynaecology and Obstetrics, People's Hospital of Zhengzhou, Zhengzhou, China;
Department of Gynaecology and Obstetrics, People's Hospital of Zhengzhou, Zhengzhou, China;
Department of Gynaecology and Obstetrics, Second Affiliated Hospital of Zhengzhou University, Zhengzhou, China;
Department of Gynaecology and Obstetrics, People's Hospital of Zhengzhou, Zhengzhou, China;
Department of Gynaecology and Obstetrics, People's Hospital of Zhengzhou, Zhengzhou, China;
Department of Gynaecology and Obstetrics, Central Hospital of Shanghai Jiading District, Shanghai, China;