Affiliation: | 1. Department of Statistics and Actuarial Science , University of Waterloo , Waterloo, Ontario, N2L 3G1, Canada c2weng@uwaterloo.ca;3. Department of Mathematics , Zhejiang University , Hangzhou, Zhejiang, 310027, China;4. Canada Research Chair in Quantitative Risk Management, Department of Statistics and Actuarial Science , University of Waterloo , Waterloo, Ontario, N2L 3G1, Canada |