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Rockville, MD : U.S. Dept. of Health and Human Services, Public Health Service, Agency for Health Care Policy and Research, [1998]
1998
Machlin, Steven R.
Rockville, MD : U.S. Dept. of Health and Human Services, Public Health Service, Agency for Healthcare Research and Quality, [2000]
2000
Cohen, Steven B., 1950-
Rockville, MD : U.S. Dept. of Health and Human Services, Public Health Service, Agency for Health Care Policy and Research, [1999]
1999