[1] Univ Hosp Bern, CH-3010 Bern, Switzerland
[2] Univ Bern, Bern, Switzerland
[3] Geron Corp, Menlo Pk, CA USA
[4] Univ Chicago, Chicago, IL 60637 USA
[5] Goethe Univ Frankfurt, Frankfurt, Germany
[6] Univ Duisburg Essen, Essen, Germany
[7] Univ Texas MD Anderson Canc Ctr, Houston, TX 77030 USA
[8] City Hope Natl Med Ctr, Hematol, Duarte, CA USA
[9] City Hope Natl Med Ctr, HCT, Duarte, CA USA