[1] UNIV INNSBRUCK, DEPT INTERNAL MED, A-6020 INNSBRUCK, AUSTRIA
[2] UNIV INNSBRUCK, DEPT SURG 1, A-6020 INNSBRUCK, AUSTRIA
[3] LUDWIG BOLTZMANN INST LEUKAMIEFORSCH, VIENNA, AUSTRIA
[4] UNIV PENN, CHILDRENS HOSP, DIV IMMUNOL, PHILADELPHIA, PA 19104 USA