Yang Lin1,2*, Baohua Wang3*, Yijun Liu1, Zhigang Yu1, Manhua Cui2 and Haichun Ma1
1The First Hospital of Jilin University, Changchun130021, China.
2Department of Gynaecology and Obstetrics, the Second Hospital of Jilin University, Changchun 130041 China.
3Department of Anesthesia, the Affiliated Hospital of Changchun University of Traditional Chinese Medicine, Changchun 130021, China.
