Duodenal Diseases

• Liuan People's Hospital — Liu‘an, Anhui, China
• Xuancheng People's Hospital — Xuancheng, Anhui, China
• The 900th Hospital of the Joint Logistic Support Force of the People's Liberation Army of China — Fuzhou, Fujian, China
• The First Hospital of Lanzhou University — Lanzhou, Gansu, China

• The First Affiliated Hospital of Bengbu Medical College — Bengbu, Anhui, China
• Liuan People's Hospital — Liu‘an, Anhui, China
• Beijing Friendship Hospital, Capital Medical University — Beijing, Beijing Municipality, China
• The Affiliated Hospital of Guzihou Medical University — Guiyang, Guizhou, China

• Assiut University Hospital — Asyut, Egypt

• Xijing Hosipital of Digestive Disease — Xi'an, Shaanxi, China

• National Medical College and Teaching Hospital — Birgunj, Nepal

• Takeda Selected Site — Tokyo, Japan

• Asian institute of Gastroenterology, hyderabad, India — Hyderabad, Telangana, India

• Asan Medical Center — Seoul, South Korea

• Faculty of Nursing — Asyut, Egypt

Not specified