About the Authors

Congcong Zhang

Affiliation International Medical Services, Peking Union Medical College Hospital, Beijing, 100730, China

Xinjuan Wu

wuxinjuan@pumch.cn

Affiliation Nursing Department, Peking Union Medical College Hospital, Beijing, 100730, China

Songbai Lin

Affiliation International Medical Services, Peking Union Medical College Hospital, Beijing, 100730, China

Zhaoxia Jia

Affiliation Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing Maternal and Child Health Care Hospital, Beijing, 100026, China

Jing Cao

Affiliation Nursing Department, Peking Union Medical College Hospital, Beijing, 100730, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: CCZ XJW. Performed the experiments: CCZ XJW SBL ZXJ JC. Analyzed the data: CCZ XJW SBL ZXJ JC. Contributed reagents/materials/analysis tools: XJW. Wrote the paper: CCZ XJW.