1. Department of Infection and Immunity, Research Center, King Faisal Specialist Hospital & Research Center, Riyadh, Saudi Arabia
2. Department of Microbiology and Immunology, Alfaisal University School of Medicine, Riyadh, Saudi Arabia
3. Institute of Hydrobiology, Department of Aquatic Microbial Ecology, Biology Centre of the Academy of Sciences of the Czech Republic, České Budějovice, Czech Republic
4. Section of Gastroenterology, Department of Medicine, College of Medicine, King Saud University, Riyadh, Saudi Arabia
5. Liver Disease Research Center, King Saud University, Riyadh, Saudi Arabia
6. Gastroenterology Unit, Department of Medicine, King Abdulaziz Medical City, Jeddah, Saudi Arabia
7. Gastroenterology Unit, Department of Medicine, King Faisal Specialist Hospital & Research Center, Riyadh, Saudi Arabia
8. Department of Gastroenterology, Prince Sultan Medical Military City, Riyadh, Saudi Arabia