[1] CHILDRENS HOSP EASTERN ONTARIO,DIV GENET,401 SMYTH RD,OTTAWA K1H 8L1,ONTARIO,CANADA
[2] UNIV OTTAWA,DEPT PEDIAT,OTTAWA K1N 6N5,ONTARIO,CANADA
[3] HOSP SICK CHILDREN,DEPT CLIN GENET,TORONTO M5G 1X8,ONTARIO,CANADA
[4] CHARING CROSS & WESTMINSTER MED SCH,DEPT ANAT,LONDON,ENGLAND
[5] ST MARYS HOSP,SCH MED,DEPT BIOCHEM & MOLEC GENET,LONDON,ENGLAND