J. Durham et al., PNEUMOCOCCAL AND INFLUENZA VACCINATION LEVELS AMONG ADULTS AGED GREATER-THAN-OR-EQUAL-TO 65 YEARS - UNITED-STATES, 1993 (REPRINTED FROM MMWR, VOL 45, PG 859, 1996), JAMA, the journal of the American Medical Association, 276(19), 1996, pp. 1544-1545