NCT04902248
- Conditions
- Digestive System Diseases, Gastrointestinal Diseases, Gastrointestinal Hemorrhage, +4 more
- Locations
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- Beijing friendship Hospital Beijing, Beijing Municipality, China
- the First Affiliated Hospital of Nanchang University Nanchang, Jiangxi, China
- Huaxi Hospital of Sichuan University Chengdu, Sichuan, China
- Endoscopy Centre, Prince of Wales Hospital Hong Kong, N.T.