1. Clinical Research Unit Mashhad University of Medical Sciences Mashhad Iran
2. Student Research Committee, Faculty of Medicine Mashhad University of Medical Sciences Mashhad Iran
3. Student Research Committee, School of Nursing and Midwifery Mashhad University of Medical Sciences Mashhad Iran
4. Clinical Research Development Unit, Faculty of Medicine Mashhad University of Medical Sciences Mashhad Iran
5. Lung Diseases Research Center Mashhad University of Medical Sciences Mashhad Iran
6. Department of Gastroenterology and Hepatology, Faculty of Medicine Mashhad University of Medical Sciences Mashhad Iran