1Department of Obstetrics and Gynecology, The First Hospital of Changsha, Changsha, 410000 People’s Republic of China
2Department of Clinical Laboratory, The First Hospital of Changsha, Changsha, 410005 People’s Republic of China
3Department of Gynecology, Hunan Provincial People’s Hospital, (The First Afliated Hospital of Hunan Normal University), No. 61, Western Jiefang Road, Changsha, 410000 Hunan People’s Republic of China
4Department of Gynecology, The Maternal and Child Health Hospital of Hunan Province, Changsha, 410000 People’s Republic of China
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