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Muñoz N, Bosch FX, Castellsagué X, Díaz M, de Sanjose S, Hammouda D, Shah KV, Meijer CJ (August 2004). «Against which human papillomavirus types shall we vaccinate and screen? The international perspective». International Journal of Cancer (2): 278–85. doi:10.1002/ijc.20244. PMID15197783.