Affiliation: | 1. Medex Clinical Trial Services, Inc., Ardmore, PA 19003, USA;2. Department of Mathematics and Statistics, University of Maryland Baltimore County, Baltimore, MD 21228, USA;3. Department of Mathematics and Statistics, University of Montreal, Montreal, Canada;1. School of Mathematical Sciences, University of Sussex, Brighton BN1 9QH, UK;2. Universiteit Gent, ZWC, Galglaan 2, 9000 Gent, Belgium |