1. Department of Mathematics and Statistics; Acadia University; Wolfville NS Canada B4P 2R6
2. S3RI and School of Mathematics; University of Southampton; SO17 1BJ UK
3. Novartis Pharma AG; 4002 Basel Switzerland
4. School of Statistics and Management; Shanghai University of Finance and Economics; People's Republic of China
5. I-BioStat, Centrum voor Statistiek (CenStat); Universiteit Hasselt; Campus Diepenbeek, Agoralaan Gebouw D, B-3590 Diepenbeek Belgium