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Notes
Medical Officer, Agency for Health Care Policy & Research, U.S. Department of Health & Human Services. Address correspondence to Dr. Hsia at the Agency for Health Care Policy & Research, 2101 East Jefferson Street, Rockville, MD 20852–3148–46.
The views presented in this article do not represent the policies of any U.S. government agency. This article is not subject to U.S. copyright laws. The author is indebted to Deby K. Blum, M.L.S., and Renee A.W. McCullough, M. Hum., M.L.S., of the Agency for Health Care Policy & Research, for their technical assistance.