A prospective study on the natural course of low-grade squamous intraepithelial lesions and the presence of HPV16 E2-, E6- and E7-specific T-cell responses von Woo, Y.L., van den Hende, M., Sterling, J.C., Coleman, N., Crawford, R.A.F., Kwappenberg, K.M.C., Stanley, M.A., Van Der Burg, S.H.