[1] MD Anderson Canc Ctr, Houston, TX USA
[2] Duke Univ, Durham, NC 27706 USA
[3] Univ Cincinnati, Med Ctr, Cincinnati, OH 45221 USA
[4] Univ Colorado, Hlth Sci Ctr, Aurora, CO USA
[5] Emory Univ, Atlanta, GA 30322 USA
[6] Johns Hopkins Univ, Baltimore, MD 21218 USA
[7] Merck Res Labs, Upper Gwynedd, PA USA
[8] Univ Pittsburgh, Pittsburgh, PA 15260 USA