1. Liver and Pancreatobiliary Diseases Research Center, Digestive Disease Research Institute, Tehran University of Medical Sciences, Tehran, Iran
2. Golestan Research Center of Gastroenterology and Hepatology, Golestan University of Medical Science, Gorgan, Iran
3. Department of Internal Medicine, Baharloo hospital, Tehran University of Medical Sciences, Tehran, Iran
4. Department of infectious diseases, Sina Hospital, Tehran University of Medical Sciences, Tehran, Iran
5. Department of Infectious Diseases, Baharloo Hospital, Tehran University of Medical Science, Tehran, Iran
6. Department of infectious diseases, Shariati Hospital, Tehran University of Medical Science, Tehran, Iran
7. Department of Pulmonary and Critical Care, Shariati Hospital, Thoracic Research Center, Tehran University of Medical Sciences, Tehran, Iran
8. Department of Radiology, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran
9. Department of Radiology and Imaging Sciences, Emory University School of Medicine, Atlanta, GA, USA
10. Department of Emergency Medicine, Homerton University Hospital, London, UK
11. School of Public Health, Imperial College London, London, UK
12. Cardiff and Vale University Health Board, Cardiff, UK
13. Department of Infectious Disease, Imperial College London, London, UK
14. Department of Pharmacology and Therapeutics, University of Liverpool, Liverpool, UK