1. aDepartment of Dermatology, George Washington School of Medicine and Health Sciences, Washington, District of Columbia
2. bDivision of Dermatology, Children’s National Hospital, Washington, District of Columbia
3. cBoston Children’s Hospital, Boston, Massachusetts
4. dThe Hospital for Sick Children, Toronto, Ontario, Canada
5. ePenn State Hershey Medical Center, Penn State Children’s Hospital, Hershey, Pennsylvania