Fig. 2. Participant characteristics. (A) The number of gastroscopy cases. (B) Self-assessed skill level in gastroscopy. (C) Possible procedures. Basic procedures: luminal observation and biopsy. Minor procedures: clipping, dye injection, and balloon dilatation. Major procedures: stent insertion, polypectomy, and endoscopic submucosal dissection. Advanced procedures: endoscopic retrograde cholangiopancreatography and enteroscopy.