1. Departmentof Epidemiology; School of Public Health; Shahid Beheshti University of Medical Sciences; Tehran Iran
2. Departmentof Epidemiology; Bam University of Medical Sciences; Bam Iran
3. Managerial Epidemiology Research Center; Department of Public Health; School of Nursing and Midwifery; Maragheh University of Medical Sciences; Maragheh Iran
4. Department of Epidemiology and Biostatistics; School of Public Health; Tehran University of Medical Sciences; Tehran Iran