[1] UNIV COPENHAGEN,INST MED GENET,DK-1168 COPENHAGEN K,DENMARK
[2] RIGSHOSP,DK-2100 COPENHAGEN O,DENMARK
[3] ROYAL CHILDRENS HOSP,PARKVILLE,VIC 3052,AUSTRALIA
[4] ST MARYS HOSP,SCH MED,LONDON,ENGLAND
[5] HOSP SICK CHILDREN,TORONTO M5G 1X8,ONTARIO,CANADA
[6] UNIV MINNESOTA,MINNEAPOLIS,MN 55455