Davidson, E., Faulkner, R., Sehr, P., Pawlita, M., Smyth, L., Burt, D., …Stern, P. (2004). Effect of TA-CIN (HPV 16 L2E6E7) booster immunisation in vulval intraepithelial neoplasia patients previously vaccinated with TA-HPV (vaccinia virus encoding HPV 16/18 E6E7). Vaccine, 22(21-22), 2722-2729. https://doi.org/10.1016/j.vaccine.2004.01.049