1 Department of Big Data in Health Science, School of Public Health, Zhejiang University, Hangzhou, PR China.
2 Department of Big Data in Health Science, School of Public Health, Zhejiang University, Hangzhou, PR China; Center for Biostatistics, Bioinformatics, and Big Data, Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, PR China.
3 School of Public Health (Shenzhen), Sun Yat-sen University, Guangzhou, PR China.
4 School of Public Health (Shenzhen), Sun Yat-sen University, Guangzhou, PR China. Electronic address: shuylong@mail.sysu.edu.cn.