[1] CHILDRENS HOSP MED CTR,DEPT MED,BOSTON,MA 02115
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[3] CHILDRENS HOSP MED CTR,DEPT CARDIOL,BOSTON,MA 02115
[4] HARVARD UNIV,SCH MED,DEPT PEDIAT,BOSTON,MA 02115
[5] BOSTON UNIV,SCH PUBL HLTH,DEPT EPIDEMIOL & BIOSTAT,BOSTON,MA 02215
[6] UNIV TORONTO,HOSP SICK CHILDREN,DIV CLIN PHARMACOL,TORONTO M5G 1X8,ONTARIO,CANADA
[7] UNIV TORONTO,PHARMACOL RES INST,TORONTO M5S 1A1,ONTARIO,CANADA
[8] SAN DIEGO STATE UNIV,DEPT COMMUN DISORDERS,SAN DIEGO,CA 92182
[9] UNIV CALIF SAN DIEGO,SCH MED,DEPT OTOLARYNGOL,SAN DIEGO,CA 92103
[10] UNIV CALIF SAN DIEGO,SCH MED,DEPT PEDIAT & SURG,SAN DIEGO,CA 92103