About the Authors

Wei-Gao Mao

Affiliation Department of Biostatistics, School of Public Health and Tropical Medicine, Southern Medical University, Guangzhou, Guangdong, China

Hai-Qiang He

Affiliation Department of Biostatistics, School of Public Health and Tropical Medicine, Southern Medical University, Guangzhou, Guangdong, China

Yan Xu

Affiliation Department of Biostatistics, School of Public Health and Tropical Medicine, Southern Medical University, Guangzhou, Guangdong, China

Ping-Yan Chen

Affiliation Department of Biostatistics, School of Public Health and Tropical Medicine, Southern Medical University, Guangzhou, Guangdong, China

Ji-Yuan Zhou

zhoujiyuan@gmail.com

Affiliation Department of Biostatistics, School of Public Health and Tropical Medicine, Southern Medical University, Guangzhou, Guangdong, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: WGM JYZ. Performed the experiments: WGM HQH JYZ. Analyzed the data: WGM HQH YX PYC JYZ. Contributed reagents/materials/analysis tools: WGM HQH JYZ. Wrote the paper: WGM JYZ. Designed the software used in analysis: WGM JYZ. Revised the manuscript: YX PYC.