About the Authors

Donghua Xie

Yangtbcsu@163.com

Affiliations Department of Epidemiology and Health Statistic, School of Public Health, Central South University, 110 Xiangya Road, Changsha, Hunan, 410078, P.R of China, Department of Information management, Maternal and Children hospital of Hunan province, 58 Xiangchun Road, Changsha, Hunan, 410078, P.R of China

Tubao Yang

Yangtbcsu@163.com

Affiliation Department of Epidemiology and Health Statistic, School of Public Health, Central South University, 110 Xiangya Road, Changsha, Hunan, 410078, P.R of China

Zhiyu Liu

Affiliation Department of Information management, Maternal and Children hospital of Hunan province, 58 Xiangchun Road, Changsha, Hunan, 410078, P.R of China

Hua Wang

Affiliation Department of Information management, Maternal and Children hospital of Hunan province, 58 Xiangchun Road, Changsha, Hunan, 410078, P.R of China

Competing Interests

The authors have declared that no competing interests exist

Author Contributions

Conceived and designed the experiments: DX TY ZL HW. Performed the experiments: DX ZL HW. Analyzed the data: DX TY. Contributed reagents/materials/analysis tools: DX ZL. Wrote the paper: DX TY.