[1] UNIV PENN,SCH MED,HOWARD HUGHES MED INST,37TH & HAMILTON WALK,PHILADELPHIA,PA 19104
[2] UNIV PENN,SCH MED,DEPT HUMAN GENET,PHILADELPHIA,PA 19104
[3] UNIV PENN,SCH MED,DEPT PEDIAT,PHILADELPHIA,PA 19104
[4] BAYLOR COLL MED,INST MOLEC GENET,HOUSTON,TX 77030
[5] BAYLOR COLL MED,HOWARD HUGHES MED INST,HOUSTON,TX 77030