1 Inner Mongolia Medical University, Department of Obstetrics and Gynaecology, Affiliated Hospital of Inner Mongolia Medical University, Hohhot North Street, Inner Mongolia, 010050, China.
2 Inner Mongolia Medical University, Department of Obstetrics and Gynaecology, Affiliated Hospital of Inner Mongolia Medical University, Hohhot North Street, Inner Mongolia, 010050, China. Electronic address: [email protected].
3 Inner Mongolia Medical University, Department of Orthopedics, Affiliated Hospital of Inner Mongolia Medical University, Hohhot North Street, Inner Mongolia, 010050, China.