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Ofelia C. Tablan, Larry J. Anderson, Nancy H. Arden, Robert F. Breiman, Jay C. Butler, Michael M. McNeil, The Hospital Infection Control Practices Advisory Committee, Guideline for Prevention of Nosocomial Pneumonia, Infection Control and Hospital Epidemiology, Vol. 15, No. 9 (Sep., 1994), pp. 587-627
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Tablan et al. (1994) studied this question.
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