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Piedra PA, Cron SG, Jewell A, Hamblett N, McBride R, Palacio MA, Ginsberg R, Oermann CM, Hiatt PW; Purified Fusion Protein Vaccine Study Group.Piedra PA, et al.Vaccine. 2003 Jun 2;21(19-20):2448-60. doi: 10.1016/s0264-410x(03)00098-7.Vaccine. 2003.PMID: 12744878Clinical Trial.