1. School of Public Health, Arak University of Medical Sciences, Arak, Iran
2. Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
3. Department of Epidemiology and Biostatistics, School of Public Health, Knowledge Utilization Research Center, Tehran University of Medical Science, Tehran, Iran
4. Memory and Behavioral Neurology Department, Roozbeh Hospital, Tehran University of Medical Science, Tehran, Iran
5. Department of Epidemiology and Biostatistics, School of Public Health, Kermanshah University of Medical Science, Kermanshah, Iran