[1] ST CHRISTOPHERS HOSP CHILDREN, INFECT DIS SECT, PHILADELPHIA, PA 19133 USA
[2] ST CHRISTOPHERS HOSP CHILDREN, DEPT PEDIAT, PHILADELPHIA, PA 19133 USA
[3] ST CHRISTOPHERS HOSP CHILDREN, DEPT NEUROL, PHILADELPHIA, PA 19133 USA
[4] TEMPLE UNIV, HLTH SCI CTR, SCH MED, PHILADELPHIA, PA 19140 USA