1. Health Policy Research Center, Institute of Health, Shiraz University of Medical Sciences, Shiraz, Iran
2. Department of Human Nutrition and Hospitality Management, College of Human Environmental Sciences, The University of Alabama, Tuscaloosa, AL, USA
3. Alabama Research Institute on Aging(ARIA), The University of Alabama, Tuscaloosa, AL, USA
4. HIV/AIDS Research Center, Institute of Health, Shiraz University of Medical Sciences, Shiraz, Iran