Duration of Cellular and Humoral Responses after Quadrivalent Human Papillomavirus Vaccination in Healthy Female Adults with or without Prior Type 16 and/or 18 Exposure oleh Lilin Lai, Kevin Ault, Nadine Rouphael, Allison Beck, Briyana Domjahn, Yongxian Xu, Evan J. Anderson, Andrew Cheng, Aya Nakamura, Rebecca J. Hoagland, Colleen Kelley, Srilatha Edupuganti, Karen Mask, Mirjana Nesin, Elizabeth R. Unger, Gitika Panicker, Hagit David, Mark J. Mulligan