1. Craniomaxillofacial Research Center; Shariati Hospital; Tehran University of Medical Sciences; Tehran Iran
2. Department of Oral and Maxillofacial Surgery; Sina Hospital; Tehran University of Medical Sciences; Tehran Iran
3. Psychosomatic Research Center, Imam Khomeini Hospital; Tehran University of Medical Science; Tehran Iran
4. Community Oral Health Department; School of Dentistry; Tehran University of Medical Sciences; Tehran Iran
5. Department of Epidemiology and Biostatistics; School of Public Health; Tehran University of Medical Sciences; Tehran Iran