Occupational exposure to HIV: frequency and rates of underreporting of percutaneous and mucocutaneous exposures by medical housestaff: Mangione CM, Gerberding JL, Cummings SR. Am J Med 1991 ;90:85–90. Reprint requests: Carol M. Mangione, MD, Harvard Faculty Development and Fellowship Program, Harvard Medical School, 330 Brookline Ave., Boston, MA 02215