Chang Y, Brewer NT, Rinas AC, Schmitt K, Smith JS (xullo de 2009). "Evaluating the impact of human papillomavirus vaccines". Vaccine27 (32): 4355–62. PMID19515467. doi:10.1016/j.vaccine.2009.03.008.
Liesegang TJ (agosto de 2009). "Varicella zoster virus vaccines: effective, but concerns linger". Can. J. Ophthalmol.44 (4): 379–84. PMID19606157. doi:10.3129/i09-126.
Chang Y, Brewer NT, Rinas AC, Schmitt K, Smith JS (xullo de 2009). "Evaluating the impact of human papillomavirus vaccines". Vaccine27 (32): 4355–62. PMID19515467. doi:10.1016/j.vaccine.2009.03.008.
Liesegang TJ (agosto de 2009). "Varicella zoster virus vaccines: effective, but concerns linger". Can. J. Ophthalmol.44 (4): 379–84. PMID19606157. doi:10.3129/i09-126.