Cytomegalovirus-specific CD8+T cells targeting different HLA/peptide combinations correlate with protection but at different threshold frequencies - Giest, S; Grace, S; Senegaglia, AC; Pasquini, R; Gonzalo-Daganzo, RM; Fernández, MN; Mackinnon, S; Madrigal, JA; Travers, PJ (BRITISH JOURNAL OF HAEMATOLOGY, 2010)