[1] UNIV PENN, SCH MED, DEPT DERMATOL, PHILADELPHIA, PA 19104 USA
[2] UNIV PENN, SCH MED, DEPT PEDIAT, PHILADELPHIA, PA 19104 USA
[3] CHILDRENS HOSP, DEPT PEDIAT DERMATOL, PHILADELPHIA, PA 19104 USA
[4] CHILDRENS HOSP, DEPT DENT, PHILADELPHIA, PA 19104 USA