[1] UNIV CALIF SAN FRANCISCO,DEPT OBSTET GYNECOL & REPROD SCI,SAN FRANCISCO,CA 94143
[2] UNIV CALIF SAN FRANCISCO,DEPT PEDIAT,SAN FRANCISCO,CA 94143
[3] STANFORD UNIV,MED CTR,SCH MED,DEPT PEDIAT,STANFORD,CA 94305
[4] STANFORD UNIV,MED CTR,SCH MED,DEPT GENET,STANFORD,CA 94305
[5] KAISER FDN HOSP,DEPT GENET,LOS ANGELES,CA 90027