About the Authors

Wenfang Yang

Affiliation The First Affiliated Hospital of Medical College in Xi’an Jiaotong University, Xi’an, Shaanxi Province, P.R. China

Lingxia Zeng

tjzlx@mail.xjtu.edu.cn

Affiliation Department of Public Health, Xi’an Jiaotong University College of Medicine, Xi’an, Shaanxi Province, P.R. China

Yue Cheng

Affiliation Department of Public Health, Xi’an Jiaotong University College of Medicine, Xi’an, Shaanxi Province, P.R. China

Zhijun Chen

Affiliation The Central of Disease Control and Prevention in Xi’an, Xi’an, Shaanxi Province, P.R. China

Xiang Wang

Affiliation The First Affiliated Hospital of Medical College in Xi’an Jiaotong University, Xi’an, Shaanxi Province, P.R. China

Xu Li

Affiliation The First Affiliated Hospital of Medical College in Xi’an Jiaotong University, Xi’an, Shaanxi Province, P.R. China

Hong Yan

Affiliation Department of Public Health, Xi’an Jiaotong University College of Medicine, Xi’an, Shaanxi Province, P.R. China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: WY LZ YC ZC XW XL HY. Performed the experiments: WY LZ YC ZC XW. Analyzed the data: WY LZ YC ZC XW. Contributed reagents/materials/analysis tools: WY LZ YC ZC. Wrote the paper: WY LZ YC ZC XW XL HY.