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2. A reason for visit classification for ambulatory care;National Center for Health Statistics,1979
3. International classification of diseases, 9th rev., clinical modification;U.S. Department of Health and Human Services,1980
4. Medication therapy in office visits for selected diagnoses: The National Ambulatory Medical Care Survey, U.S., 1980;National Center for Health Statistics,1983
5. A study of the practice of dermatology in the United States;Mendenhall;Arch Dermatol,1978