1. Actuarial Research Center, Department of Statistics, University of Haifa, Haifa, Israel
2. Faculty of Sciences, Holon Institute of Technology, Holon, Israel
3. Maxwell Institute for Mathematical Sciences and School of Mathematical and Computer Sciences, Heriot-Watt University, Edinburgh, UK
4. Department of Risk Management and Actuarial Science, School of Statistics, Renmin University of China, Beijing, People's Republic of China