[1] CHILDRENS HOSP MED CTR, DEPT EMERGENCY, 300 LONGWOOD AVE, BOSTON, MA 02115 USA
[2] CHILDRENS HOSP MED CTR, DEPT MED, BOSTON, MA 02115 USA
[3] HARVARD UNIV, SCH MED, BOSTON, MA 02115 USA
[4] CHILDRENS HOSP, DEPT PEDIAT, PHILADELPHIA, PA 19104 USA
[5] CHILDRENS HOSP, DEPT RADIOL, PHILADELPHIA, PA 19104 USA
[6] UNIV PENN, SCH MED, PHILADELPHIA, PA 19104 USA