[1] CHILDRENS HOSP MED CTR,DIV GENET,BOSTON,MA 02115
[2] CHILDRENS HOSP MED CTR,CTR MENTAL RETARDAT,BOSTON,MA 02115
[3] HARVARD UNIV,SCH MED,DEPT PEDIAT,BOSTON,MA 02115
[4] HARVARD UNIV,SCH MED,DEPT GENET,BOSTON,MA 02115
[5] UNIV COLORADO,HLTH SCI CTR,ELEANOR ROOSEVELT INST CANC RES,DENVER,CO 80262