1. Beijing International Center for Mathematical Research, Peking University, Beijing, China
2. Chongqing Big Data Research Institute, Peking University, Chongqing, China
3. School of Mathematics and Statistics, University of Sydney, Sydney, Australia
4. School of Mathematical Sciences, Peking University, Beijing, China
5. Center for Statistical Sciences, Peking University, Beijing, China
6. Faculty of Science and Engineering, University of Nottingham Ningbo China, Ningbo, China
7. Department of Biostatistics, School of Public Health, Peking University, Beijing, China