1. Institute of Insurance Science, University of Ulm, Helmholtzstrasse 20, 89069 Ulm, Germany
2. École d'Actuariat, Université Laval, 2425, rue de l'Agriculture, Québec G1V 0A6, Canada
3. School of Economic Mathematics – Statistics, University of Economics Ho Chi Minh City, 59C Nguyen Dinh Chieu Street, Ho Chi Minh City, Vietnam