1. School of Mathematical Sciences, Dalian University of Technology, Dalian, China
2. Department of Statistics, The Pennsylvania State University, University Park, PA
3. Meta, Menlo Park, CA
4. The Center for Applied Statistics and Institute of Statistics and Big Data, Renmin University of China, Beijing, China
5. Department of Biostatistics, School of Public Health and Beijing International Center for Mathematical Research, Peking University, Beijing, China