Sequential Immunization with gp140 Boosts Immune Responses Primed by Modified Vaccinia Ankara or DNA in HIV-Uninfected South African Participants. - Churchyard G; Mlisana K; Karuna S; Williamson AL; Williamson C; Morris L; Tomaras GD; De Rosa SC; Gilbert PB; Gu N; Yu C; Mkhize NN; et al. (PloS one, 2016)