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Gordon B. Willis
Applied Research Program, Division of Cancer Control and Population Sciences, National Cancer Institute, National Institute of Health, 9609 Medical Center Drive, Bethesda, Maryland, 20892-9762, U.S.A.
Tom W. Smith
NORC, University of Chicago, 1155 East 60th street, Chicago, IL 60637, U.S.A
Salma Shariff-Marco
Cancer Prevention Institute of California, 2201 Walnut Ave, Suite 300, Fremont, CA 94538, U.S.A.
Ned English
NORC at the University of Chicago, Statistics and Methodology, 55 E. Monroe St., Suite 2000, Chicago, IL 60647, U.S.A.