1 Department of Obstetrics and Gynecology, Zaozhuang Hospital of Traditional Chinese Medicine, Zaozhuang, China.
2 Department of Postpartum Health Care Pelvic Floor Function Diagnosis and Treatment Center, Zaozhuang Maternal and Child Health Care Hospital, Zaozhuang, China.
3 Department of Gynecology, Zaozhuang Maternal and Child Health Care Hospital, Zaozhuang, China.
4 Department of Obstetrics and Gynecology, Zaozhuang Municipal Hospital, Zaozhuang, China - longfuzhen@163.com.