1. Department of BiostatisticsUNC at Chapel Hill Chapel Hill North Carolina
2. Canadian Cancer Trials Group and Department of Public Health SciencesQueen's University Kingston Ontario Canada
3. Department of Mathematics and StatisticsUNC at Greensboro Greensboro North Carolina
4. Division of Pharmacotherapy and Experimental Therapeutics, Eshelman School of PharmacyUNC at Chapel Hill Chapel Hill North Carolina