School of Clinical Medicine, Qinghai University, Xining, Qinghai Province, 810000, China
Liehong Wang
Corresponding author.; Department of Gynaecology and Obstetrics, Qinghai Red Cross Hospital, Xining, Qinghai Province, 810000, China; School of Clinical Medicine, Qinghai University, Xining, Qinghai Province, 810000, China
Qingling Qi
Corresponding author.; Department of Gynaecology and Obstetrics, Qinghai Red Cross Hospital, Xining, Qinghai Province, 810000, China
Zuchun Wang
Corresponding author.; Department of Gynaecology and Obstetrics, Qinghai Red Cross Hospital, Xining, Qinghai Province, 810000, China
