1. Dermatology Division; Children's National Medical Center; Washington DC USA
2. Children's Medical Center; Tehran University of Medical Sciences; Tehran Iran
3. Department of Dermatopathology; Razi Hospital; Tehran University of Medical Sciences; Tehran Iran
4. Department of Dermatology; Warren Alpert Medical School; Brown University; Providence RI USA
5. School of Medicine & Health Sciences; George Washington University; Washington DC USA