1. School of Statistics and Information, Shanghai University of International Business and Economics, Shanghai, 201620, China()
2. C.A.S.E.—Center for Applied Statistics and Economics, Humboldt-Universität zu Berlin, 10178 Berlin, Germany, and Singapore Management University, Singapore 178899()
3. King’s College London, London, United Kingdom, and Ladislaus von Bortkiewicz Chair of Statistics, Humboldt-Universität zu Berlin, 10178 Berlin, Germany()
4. Department of Mathematics, Hong Kong Baptist University, Hong Kong, China, and School of Statistics, Beijing Normal Univeristy, Beijing, China()