1 The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China

2 University of Texas Health Science Center at Houston, Houston, United States

3 Linfen Central Hospital, Linfen, China

4 JingXing County Hospital, Hebei, China

1 The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China

2 Linfen Central Hospital, Linfen, China

3 JingXing County Hospital, Hebei, China

1 Faculty of Medicine, Cairo University, Ciro, Egypt

2 King Abdulaziz National Guard Hospital-Ahsa, Ahsa, Saudi Arabia

3 Zamzam University College, Faculty of Medicine, Khartoum, Sudan

4 Doctors Hospital and Medical Centre, Lahore, Pakistan

5 University of Medicine and Pharmacy Iuliu Hatieganu Cluj-Napoca, Romania, Cluj Napoca, Romania

6 Hopital ibn sina / universite mohamed v / faculte de medecine, Rabat, Morocco

7 King Abdulaziz University Hospital, Jeddah, Saudi Arabia

8 Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia

9 University Hospital Southampton NHS Foundation Trust, Southampton, United Kingdom

10 Maadi Armed Forces Medical Complex, Cairo, Egypt

11 Sulaimani Teaching Hospital, Sulaymaniyah, Iraq

12 Qena Faculty of Medicine, Qena, Egypt

13 Mansoura University, Mansoura, Egypt

14 King Fahad Medical City, Riyadh, Saudi Arabia

15 Ain Shams University, Cairo, Egypt

16 Najdeh Hospital, Nabatieh, Lebanon

17 Assiut university, Assuit, Egypt

18 Medical School, Oujda, Morocco

19 Fatema el Azhar Oncology and Radiotherapy Centre, Algiers, Algeria

20 Faculty of Medicine Mansoura University/ Egyptian Liver Hospital, Mansoura, Egypt, Mansoura- dakahleya, Egypt

21 Chifa Clinic Hydra, Algiers, Algeria

22 Siriraj Hospital, Bangkok, Thailand

23 Military hospital Mohamed V-Souissi University, Rabat, Morocco

24 Mhammed V University, Ibn Sina Hospital, Rabat, Morocco

25 Mansoura faculty of medicine, Mansoura, Egypt

26 Al-Azhar University, Cairo, Egypt

27 Theodor Bilharz Research Institute, Cairo, Egypt

28 Mansoura Specialized Medical Hospital, Mansoura, Egypt

1 The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China

1 St. George’s University Hospitals NHS Foundation Trust, London, United Kingdom

2 National and Kapodistrian University of Athens, Athens, Greece

1 Centro Hospitalar e Universitário de Lisboa Norte, Lisboa, Portugal

2 Faculdade de Medicina de Lisboa, Lisbon, Portugal

3 Centro Hospitalar Universitário Lisboa Central, Lisboa, Portugal

4 Centro Hospital de São Bernardo, Palmela, Portugal

5 Hospital Beatriz Ângelo, Lisboa, Portugal

1 A.S. Loginov Moscow Clinical Scientific Center, Moscow, Russian Federation

2 Organizational and Methodological Department on Gastroenterology of Moscow Department of Health, 111111, Russian Federation

3 Russian University of Medicine, Moscow, Russian Federation

4 Tver State Medical University, Tver, Russian Federation