Endoscopic submucosal dissection for early signet ring cell gastric cancer: A systematic review and meta-analysis

Table 3 Methodological quality of included studies measured by the Newcastle-Ottawa Scale

Ref.	Selection	Comparability	Exposure or outcome	Total
Kang et al[10], 2010	4	1	2	7
Choi et al[11], 2013	4	2	3	9
Kim et al[12], 2014	4	1	3	8
Jeon et al[13], 2018	4	1	2	7
Horiuchi et al[15], 2018	4	1	3	8
Kwak et al[14], 2018	4	1	3	8
Ahn et al[16], 2020	4	1	3	8