An Ad5-vectored HIV-1 vaccine elicits cell-mediated immunity but does not affect disease progression in HIV-1-infected male subjects: results from a randomized placebo-controlled trial (the Step study). - Fitzgerald DW; Janes H; Robertson M; Coombs R; Frank I; Gilbert P; Loufty M; Mehrotra D; Duerr A (The Journal of infectious diseases, 2011)