1. School of Statistics and Data Science & Key Laboratory of Pure Mathematics and Combinatorics Nankai University Tianjin People's Republic of China
2. Department of Mathematical Sciences University of Texas El Paso Texas
3. Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing People's Republic of China
4. Department of Preventive Medicine Northwestern University Feinberg School of Medicine Chicago Illinois
5. Division of Biostatistics Washington University in St. Louis St. Louis Missouri