Affiliation: | 1. Department of Medical Statistics, University of Goettingen, , 37073 Goettingen, Germany;2. Department of Mathematics and Statistics York University, , Toronto, Canada;3. Fachbereich Mathematik, Universit?t Salzburg, , 5020 Salzburg, Austria;4. Department of Statistics, University of Kentucky, , Lexington, KY, 40536 USA |