1. Stem Cell Research Center, Golestan University of Medical Sciences, Gorgan, Iran;
2. Golestan Research Center of Gastroenterology and Hepatology, Golestan University of Medical Sciences, Gorgan, Iran;
3. Joint, Bone and Connective tissue Research Center (JBCRC), Golestan University of Medical Sciences, Gorgan, Iran;
4. Department of Biostatistics, Faculty of Health, Golestan University of Medical Sciences, Gorgan, Iran;
5. Infectious Diseases Research Center and Laboratory Science Research Center, Golestan University of Medical Sciences, Gorgan, Iran