1. Department of Periodontology, Faculty of Dentistry, Ilam University of Medical Sciences, Ilam, Iran.
2. Department of Internal Medicine, Shahid-Mostafa Khomeini hospital, Ilam University of Medical Sciences, Ilam, Iran.
3. Student Research of Committee, Alborz University of Medical Sciences, Karaj, Iran.
4. Department of Biostatistics, Faculty of Health, Ilam University of Medical Sciences, Ilam, Iran.
5. Faculty of Dentistry, Alborz University of Medical Sciences, Karaj, Iran.