[1] VIENNA UNIV,ST ANNA CHILDREN HOSP,INST CLIN CHEM,LAB DIAG,A-1010 VIENNA,AUSTRIA
[2] VIENNA UNIV,INST IMMUNOL,A-1010 VIENNA,AUSTRIA
[3] FREE UNIV BERLIN,KLINIKUM STEGLITZ,DEPT INTERNAL MED,D-1000 BERLIN 45,FED REP GER
[4] UNIV GIESSEN,DEPT PEDIAT,D-6300 GIESSEN,FED REP GER
[5] UNIV ULM,DEPT PEDIAT,D-7900 ULM,FED REP GER
[6] UNIV HANOVER,DEPT PEDIAT ONCOL,D-3000 HANOVER,FED REP GER