About the Authors

Dongdong Hao

Contributed equally to this work with: Dongdong Hao, Tengteng Ma

Roles Conceptualization, Data curation, Formal analysis, Writing – original draft, Writing – review & editing

Affiliation Jinan Maternity and Child Care Hospital affiliated to Shandong First Medical University, China

Tengteng Ma

Contributed equally to this work with: Dongdong Hao, Tengteng Ma

Roles Data curation, Formal analysis, Investigation, Writing – original draft, Writing – review & editing

Affiliation Jinan Maternity and Child Care Hospital affiliated to Shandong First Medical University, China

Xiaoping Li

Roles Formal analysis, Supervision, Validation, Visualization, Writing – review & editing

Affiliation Jinan Maternity and Child Care Hospital affiliated to Shandong First Medical University, China

Fengchun Gao

Roles Conceptualization, Data curation, Methodology, Resources, Writing – original draft, Writing – review & editing

Fengchungaoyx@sina.cn

Affiliation Jinan Maternity and Child Care Hospital affiliated to Shandong First Medical University, China

Competing Interests

The authors have declared that no competing interests exist.