1. Département de Mathématiques, Université de Sherbrooke, Sherbrooke, QC, Canada;
2. Centre de Recherche du Centre Hospitalier Universitaire de Sherbrooke, Sherbrooke, QC, Canada;
3. Department of Statistics, Texas A&M University, College Station, TX;
4. School of Mathematical and Physical Sciences, University of Technology Sydney, Broadway, NSW, Australia;
5. School of Mathematics and Statistics and Australian Research Council Centre of Excellence for Mathematical and Statistical Frontiers, University of Melbourne, Parkville, VIC, Australia