HPV16 seropositivity and subsequent HPV16 infection risk in a naturally infected population: comparison of serological assays. oleh Shih-Wen Lin, Arpita Ghosh, Carolina Porras, Sarah C Markt, Ana Cecilia Rodriguez, Mark Schiffman, Sholom Wacholder, Troy J Kemp, Ligia A Pinto, Paula Gonzalez, Nicolas Wentzensen, Mark T Esser, Katie Matys, Ariane Meuree, Wim Quint, Leen-Jan van Doorn, Rolando Herrero, Allan Hildesheim, Mahboobeh Safaeian, Costa Rican Vaccine Trial Group