Gastric neuroendocrine neoplasms type 1: A systematic review and meta-analysis

Table 2 Newcastle-Ottawa scale cohort star template

Included studies	Selection	Comparability	Outcome
Ahlman et al[13], 1994	***	*	**
Borch et al[19], 2005	****	**	**
Chen et al[18], 2015	***	*	**
Kiim et al[25], 2010	***	*	**
Louthan et al[24], 2014	***	*	**
Rappel et al[22], 1995	***	*	**
Rindi et al[14], 1996	***	**	**
Safatle-Ribeiro et al[15], 2006	***	**	**
Sagatun et al[17], 2016	***	*	*
Sato et al[20], 2014	***	*	*
Schindl et al[21], 2001	***	*	**
Thomas et al[23], 2013	***	*	**
Vanoli et al[16], 2018	***	**	**

The total Newcastle-Ottawa scale scores ranged from 0 (worst) to 9 (best) for the included cohort studies, with a score of at least 6 indicating high quality.