Acknowledgments
We would like to thank the ATUS staff at the U.S. Bureau of Labor
and Statistics for their technical assistance with this project. The first
author was supported by the Cancer Prevention Fellowship Program,
Office of the Director, National Cancer Institute, National Institutes of
Health during the preparation of this paper. The views and opinions
expressed in this paper are those of the authors and not necessarily
those of the Department of Health and Human Services, the National
Institutes of Health, or the National Cancer Institute.