Chang Y, Brewer NT, Rinas AC, Schmitt K, Smith JS (July 2009). „Evaluating the impact of human papillomavirus vaccines“. Vaccine. 27 (32): 4355–62. doi:10.1016/j.vaccine.2009.03.008. PMID19515467.
Chang Y, Brewer NT, Rinas AC, Schmitt K, Smith JS (July 2009). „Evaluating the impact of human papillomavirus vaccines“. Vaccine. 27 (32): 4355–62. doi:10.1016/j.vaccine.2009.03.008. PMID19515467.