1. Center for Statistical Science, Tsinghua University, Beijing, China
2. Department of Industrial Engineering, Tsinghua University, Beijing, China
3. School of Statistics, Beijing Normal University, Beijing, China
4. MOE Key Lab of Econometrics, WISE, Xiamen University, Xiamen, Fujian, China
5. Department of Statistics and Data Science, SOE, Xiamen University, Xiamen, Fujian, China