[1] Johns Hopkins Univ, Sch Med, Dept Mol & Comparat Pathobiol, Baltimore, MD 21205 USA
[2] German Canc Res Ctr, Div Canc Genome Res, D-69120 Heidelberg, Germany
[3] Heidelberg Biolabs GmbH, D-69120 Heidelberg, Germany
[4] Johns Hopkins Univ, Sch Med, Dept Surg, Baltimore, MD 21205 USA
[5] NCI, Ctr Canc Res, NIH, Bethesda, MD 20892 USA
[6] Johns Hopkins Univ, Sch Med, Dept Neurol, Baltimore, MD 21205 USA