About the Authors

Ji-Juan Xing

Contributed equally to this work with: Ji-Juan Xing, Xiu-Fen Liu

Affiliation Anesthesia Department, Maternal and Child Health Hospital of Nanning City, Nanning 530011, China

Xiu-Fen Liu

Contributed equally to this work with: Ji-Juan Xing, Xiu-Fen Liu

Affiliation Pain Management Department, First Affiliated Hospital of Peking University, Beijing 100034, China

Xiao-Ming Xiong

Affiliation Obstetrics and Gynecology Department, Maternal and Child Health Hospital of Nandan County, Hechi 547200, China

Li Huang

Affiliation Pain Management Department, First Affiliated Hospital of Peking University, Beijing 100034, China

Cheng-Yi Lao

Affiliation Anesthesia Department, Maternal and Child Health Hospital of Nanning City, Nanning 530011, China

Mei Yang

Affiliation Maternity Care Department, Maternal and Child Health Hospital of Nanning City, Nanning 530011, China

Shan Gao

Affiliation Maternity Care Department, Maternal and Child Health Hospital of Nanning City, Nanning 530011, China

Qiong-Yan Huang

Affiliation Anesthesia Department, Maternal and Child Health Hospital of Nanning City, Nanning 530011, China

Wei Yang

Affiliation Anesthesia Department, Maternal and Child Health Hospital of Nanning City, Nanning 530011, China

Yun-Feng Zhu

1069052046@qq.com (DHZ); xingjijuan123@163.com (YFZ)

Affiliation Anesthesia Department, Maternal and Child Health Hospital of Nanning City, Nanning 530011, China

Di-Hua Zhang

1069052046@qq.com (DHZ); xingjijuan123@163.com (YFZ)

Affiliation Child Care Department, Maternal and Child Health Hospital of Nanning City, Nanning 530011, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JJX YFZ DHZ. Performed the experiments: JJX CYL QYH WY YFZ DHZ. Analyzed the data: XFL XMX LH. Contributed reagents/materials/analysis tools: JJX MY SG. Wrote the paper: JJX YFZ DHZ. Drafted protocol: JJX.