[1] Univ Texas Hlth Sci Ctr San Antonio, San Antonio, TX USA
[2] Univ Chicago, Chicago, IL 60637 USA
[3] Univ Texas MD Anderson Canc Ctr Houston, Houston, TX USA
[4] Humboldt Univ, D-1086 Berlin, Germany
[5] Univ Bologna, I-40126 Bologna, Italy
[6] Novartis Pharma AG, Basel, Switzerland
[7] Med Klin 3, Frankfurt, Germany