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Revised.
U.S. Dept. of Health and Human Services, Public Health Service, Agency for Health Care Policy and Research, Available from National Technical Information Service
1991
U.S. Department of Health and Human Services, Public Health Service, Agency for Health Care Policy and Research
1990
U.S. Dept. of Health and Human Services, Public Health Service, Agency for Health Care Policy and Research, Available from the National Technical Information Service
1990