[1] Univ Texas, Hlth Sci Ctr, Dept Pediat, San Antonio, TX 78229 USA
[2] Univ Texas, Hlth Sci Ctr, Childrens Canc Res Inst, Tumor Virol Program, San Antonio, TX 78229 USA
[3] Univ Texas, Hlth Sci Ctr, Dept Immunol & Microbiol, San Antonio, TX 78229 USA
[4] Univ Texas, Hlth Sci Ctr, Dept Med, San Antonio, TX 78229 USA
[5] San Antonio Canc Inst, San Antonio, TX 78229 USA