1. Basic and Molecular Epidemiology of Gastrointestinal Disorders Research CenterResearch Institute for Gastroenterology and Liver DiseasesShahid Beheshti University of Medical SciencesTehranIran
2. IBD CenterVirginia Tech Carilion School of MedicineRoanokeVAUSA
3. Department of Clinical and Experimental Medical SciencesUniversity of Udine School of MedicineUdineItaly
4. Bone and Joint Reconstruction Research CenterShafa Orthopedic HospitalIran University of Medical SciencesTehranIran
5. Department of Epidemiology and BiostatisticsArnold School of Public HealthUniversity of South CarolinaColumbiaSCUSA
6. Gastroenterology and Liver Diseases Research CenterResearch Institute for Gastroenterology and Liver DiseasesShahid Beheshti University of Medical SciencesTehranIran