1. Faculty of Traditional Persian Medicine, School of Persian and Complementary Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
2. Department of Epidemiology, Faculty of Health, Mashhad University of Medical Sciences, Mashhad, Iran
3. Lung Disease Research Center, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
4. Department of Epidemiology, School of Public Health, Iran University of Medical Sciences, Tehran, Iran
5. Department of Community Medicine and Public Health, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
6. Department of Internal Medicine, Faculty of Medicine, Islamic Azad University-Mashhad Branch, Mashhad, Iran
7. Department of Internal, Mashhad University of Medical Sciences, Mashhad, Iran