[1] STATE UNIV GRONINGEN,DEPT PEDIAT,9700 AB GRONINGEN,NETHERLANDS
[2] NETHERLANDS RED CROSS,BLOOD TRANSFUS SERV,CENT LAB,DEPT MOLEC BIOL,AMSTERDAM,NETHERLANDS
[3] STATE UNIV GRONINGEN,MED MICROBIOL LAB,9700 AB GRONINGEN,NETHERLANDS
[4] WILHELMINA CHILDRENS HOSP,METAB DIS LAB,UTRECHT,NETHERLANDS