Table 2. Evaluation Methods to Determine Whether Endoscopic Submucosal Dissection Is Indicated.

Question	Answer (%)
Is the use of magnification endoscopy essential to determine whether ESD is indicated?	1. No (HD level endoscopy is enough)	27.3
	2. Rarely (<10%)	63.6
	3. Sometimes (10%–50%)	0
	4. Usually (>50%)	9.1
	5. Almost always (>90%)	0
Is the use of NBI essential to determine whether ESD is indicated?	1. No (HD level endoscopy is enough)	15.4
	2. Rarely (<10%)	23.1
	3. Sometimes (10%–50%)	30.8
	4. Usually (>50%)	23.1
	5. Almost always (>90%)	7.7
Is the use of EUS essential to determine whether ESD is indicated?	1. No (HD level endoscopy is enough)	23.1
	2. Rarely (<10%)	38.5
	3. Sometimes (10%–50%)	38.5
	4. Usually (>50%)	0
	5. Almost always (>90%)	0
Is the use of EUS essential to determine whether ESD is indicated?	1. Rectal EUS only	42.9
	2. Both colon and rectal EUS	57.1
Practically, which method do you most commonly use to determine whether you try ESD or not?	1. Gross morphology	60.0
	2. Magnifying colonoscopy	0
	3. NBI	0
	4. EUS	0
	5. Nonlifting sign	40.0
Ideally, what is the most accurate method for evaluating the depth of invasion, in your opinion?	1. Gross morphology	23.1
	2. Magnifying colonoscopy	30.8
	3. NBI	15.4
	4. EUS	30.8
	5. Nonlifting sign	0

ESD, endoscopic submucosal dissection; HD, high definition; NBI, narrow band imaging.