Vaccarella, S, Herrero, R, Snijders, P J F, Dai, M, Thomas, JO, Hieu, N T, Ferreccio, C, Matos, E, Posso, H, de Sanjose, S, Shin, HR, Sukvirach, S, Lazcano-Ponce, E, Munoz, N, Meijer, C J L M & Franceschi, S 2008, ' Smoking and human papillomavirus infection: pooled analysis of the International Agency for Research on Cancer HPV Prevalence Surveys ', International Journal of Epidemiology, vol. 37, no. 3, pp. 536-546 . https://doi.org/10.1093/ije/dyn033 International Journal of Epidemiology, 37(3), 536-546. Oxford University Press
Lancet, 366(9490), 991-998. Elsevier Limited Clifford, GM, Gallus, S, Herrero, R, Munoz, N, Snijders, P J F, Vaccarella, S, Anh, P T, Ferreccio, C, Hieu, N T, Matos, E, Molano, M & Rajkumar, R 2005, ' Worldwide distribution of human papillomavirus types in cytologically normal women in the International Agency for Research on Cancer HPV prevalence surveys: a pooled analysis ', Lancet, vol. 366, no. 9490, pp. 991-998 . https://doi.org/10.1016/S0140-6736(05)67069-9