1. School of Statistics, University of International Business and Economics , Beijing , China
2. Centre of Data Innovation Research, Department of Physics, Astronomy and Mathematics, School of Physics, Engineering and Computer Science, University of Hertfordshire , Hatfield , UK
3. Department of Mathematics, Brunel University London , Uxbridge , UK
4. Blockchain Research Center, Humboldt-Universität zu Berlin , Berlin , Germany
5. Institute of Statistics and Data Science, Xinjiang University of Finance and Economics , Urumqi , China
6. Department of Medical Engineering and Technology, Xinjiang Medical University , Urumqi , China
7. Center for Applied Statistics, School of Statistics, Renmin University of China , Beijing , China