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Yih, W Katherine, Tracy A. Lieu, Virginia H. Rêgo, Megan A. O'Brien, David K. Shay, Deborah S. Yokoe, و Richard Platt. Attitudes of Healthcare Workers in U.S. Hospitals Regarding Smallpox Vaccination. BioMed Central, 2003.

Yih, W Katherine, et al. Attitudes of Healthcare Workers in U.S. Hospitals Regarding Smallpox Vaccination. BioMed Central, 2003.