1. Department of Epidemiology and Biostatistics, School of Public Health, Iran University of Medical Sciences, Tehran, Iran;
2. Faculty of Medicine, Department of Internal Medicine, Mashhad University of Medical Sciences, Mashhad, Iran;
3. Faculty of Medicine, Department of Emergency Medicine, Mashhad University of Medical Sciences, Mashhad, Iran;
4. School of Public Health and Safety, Shahid Beheshti University of Medical Sciences, Tehran, Iran;
5. Department of Biostatistics and Epidemiology, School of Medicine, Zanjan University of Medical Sciences, Zanjan, Iran;
6. Department of Occupational Health Engineering, School of Public Health, Iran University, Tehran, Iran