1. Department of Geriatric Health, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
2. Department of Biostatistics and Epidemiology, School of Health, Mazandaran University of Medical Sciences, Sari, Iran
3. Department of Geriatric Nursing, School of Nursing and Midwifery, Mazandaran University of Medical Sciences, Sari, Iran
4. Dental Research Center, Mazandaran University of Medical Sciences, Sari, Iran
5. Department of Geriatric Health, School of Health, Mazandaran University of Medical Sciences, Sari, Iran