Affiliation: | 1 Department of Biostatistics, Harvard School of Public Health and Dana-Farber Cancer Institute, 44 Binney Street, Boston, Massachusetts 02115, U.S.Aibrahim{at}jimmy.harvard.edu 2 Department of Mathematical Sciences, Worcester Polytechnic Institute, 100 Institute Road, Worcester, Massachusetts 01609, U.S.A.mhchen{at}wpi.edu 3 Department of Biostatistics and Epidemiology, Medical University of South Carolina, 135 Rutledge Avenue, Charleston, South Carolina 29425, U.S.A. lipsitzs{at}musc.edu |