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HPV vaccines , such as Gardasil and Cervarix , reduce the incidence of cervical cancer , by inoculating against the viral strains involved in cancer development .
 Gardasil, Cervarix
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Gardasil, Cervarix