1 From Information Management Systems, Inc., Rockville, MD, and Biostatistics Unit, Gertner Institute for Epidemiology and Health Policy Research, Tel Hashomer, Israel (LSF; email: lsf@actcom.co.il); Department of Statistics, Texas A&M University, College Station, TX (RJC); Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA (MLN, RLP, and LFT); Departments of Epidemiology and Nutrition, Harvard School of Public Health, Boston, MA (DS and WW); and Division of Cancer Control and Population Sciences, National Cancer Institute, Bethesda, MD (AFS).