[1] Hannover Med Sch, Dept Pediat Nephrol, D-30655 Hannover, Germany
[2] Hannover Med Sch, Inst Pathol, D-30655 Hannover, Germany
[3] Hannover Med Sch, Inst Transfus Med, D-30655 Hannover, Germany
[4] Integrated Res & Treatment Ctr Transplantat, Hannover, Germany