[1] Univ Hosp Aachen, Aachen, Germany
[2] Univ Jena, Dept Pediat, D-6900 Jena, Germany
[3] Univ Maryland, Greenebaum Canc Ctr, Baltimore, MD 21201 USA
[4] Univ Maryland, Sch Med, Dept Med, Baltimore, MD 21201 USA
[5] Baltimore Vet Med Ctr, Baltimore, MD USA
[6] Univ Erlangen Nurnberg, Inst Human Genet, D-8520 Erlangen, Germany
[7] Univ Bonn, Inst Pharm, D-5300 Bonn, Germany