1. Ladislaus von Bortkiewicz Chair of Statistics, C.A.S.E. - Center for Applied Statistics and Economics, Humboldt-Universität zu Berlin, Unter den Linden 6, 10099 Berlin, Germany ()
2. Fakultät für Mathematik, Ruhr-Universität Bochum, 44780 Bochum, Germany ()
3. Ladislaus von Bortkiewicz Chair of Statistics, C.A.S.E. - Center for Applied Statistics and Economics, Humboldt-Universität zu Berlin, Unter den Linden 6, 10099 Berlin, Germany, and School of Business, Singapore Management University, Singapore, 178899, Singapore ()