1. Department of Applied Mathematics, Computer Science and Statistics Ghent University Krijgslaan 281 Gent 9000 Belgium
2. Department of Mathematical Modelling, Statistics and Bioinformatics Ghent University Coupure Links 653a Gent 9000 Belgium
3. National Institute for Applied Statistics Research Australia (NIASRA), School of Mathematics and Applied Statistics University of Wollongong Wollongong, NSW 2522 Australia