1. Department of Dermatology; Autoimmune Bullous Diseases Research Center; Tehran University of Medical Sciences; Tehran Iran
2. Department of Dermatopathology; Razi Hospital; Tehran University of Medical Sciences; Tehran Iran
3. Shahid Beheshti University of Medical Sciences; Tehran Iran
4. School of Public Health; Gonabad University of Medical Sciences; Gonabad Iran
5. Department of Epidemiology and Biostatistics; Tehran University of Medical Sciences; Tehran Iran