Safety, tolerability, and antibody responses in humans after sequential immunization with a PfCSP DNA vaccine followed by the recombinant protein vaccine RTS,S/AS02A - Epstein, Judith E.; Charoenvit, Yupin; Kester, Kent E.; Wang, Ruobing; Newcomer, Rhonda; Fitzpatrick, Steve; Richie, Thomas L.; Tornieporth, Nadia; Heppner, D. Gray; Ockenhouse, Chris; Majam, Victoria; Holland, Carolyn; et al. (Vaccine, 2004)