[1] Division of Haematology/Oncology,
[2] The Hospital for Sick Children,undefined
[3] Toronto,undefined
[4] Ontario,undefined
[5] Present address: University Children's Hospital,undefined
[6] Steinwiesstrasse 75,undefined
[7] 8032 Zürich,undefined
[8] Tel.: +41-1-2667111,undefined
[9] Fax: +41-1-2667171,undefined
[10] e-mail: manuela.albisetti@kispi.unizh.ch,undefined