1. Pharmaceutical Sciences Research Center, Health Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran
2. Department of Pharmacoeconomics and Pharmaceutical Administration, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
3. Rheumatology Research Center, Tehran University of Medical Sciences, Tehran, Iran
4. Department of Economics, School of Economics and Political Sciences, Shahid Beheshti University, Tehran, Iran
5. Pharmaceutical Management and Economics Research Center, Tehran University of Medical Sciences, Tehran, Iran