About the Authors

Jun Zhang

Affiliation Department of Preventive Medicine, Shantou University Medical College, Shantou, Guangdong, China

Zhiwei Xu

Affiliation Department of Medical Quality Control, 302 PLA hospital, Beijing, China

Lingxiang Yu

Affiliation Department of Hepatobiliary Surgery, 302 PLA hospital, Beijing, China

Meilan Chen

Affiliation Department of Preventive Medicine, Shantou University Medical College, Shantou, Guangdong, China

Ke Li

kli@stu.edu.cn

Affiliation Department of Preventive Medicine, Shantou University Medical College, Shantou, Guangdong, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: KL. Performed the experiments: JZ ZWX LXY KL. Analyzed the data: JZ ZWX MLC. Contributed reagents/materials/analysis tools: JZ ZWK KL MLC. Wrote the paper: JZ.