1. Liver and Gastrointestinal Disease Research Center; Tabriz University of Medical Sciences; Tabriz Iran
2. Iranian Center for Evidence-Based Medicine; Tabriz University of Medical Sciences; Tabriz Iran
3. Hospital Management Research Center; Tabriz University of Medical Sciences; Tabriz Iran
4. Tabriz University of Medical Sciences; Tabriz Iran
5. Medical Philosophy and History Research Center; Tabriz University of Medical Sciences; Tabriz Iran