Is Dor fundoplication optimum after laparoscopic Heller myotomy for achalasia? A meta-analysis

Table 4 Quality assessment of non-random controlled studies in the meta-analysis based on modified Newcastle-Ottawa Scale judgment

Ref.	Selection		Comparability	Outcome assessment		Quality judgment
	1	2	3	4	5
Dempsey et al[12], 2004	*	*	**	*	*	******
Di Martino et al[13], 2011	*	*	**	*	*	******
Finley et al[14], 2007	*	*	*	*	*	*****
Oelschlager et al[15], 2003	*	*	*	*	--	****
Ramacciato et al[16], 2005	*	*	*	*	*	*****
Richardson et al[20], 2006	*	*	**	*	--	*****
Tapper et al[22], 2008	*	--	*	*	*	****
Wright et al[24], 2007	*	*	*	*	--	****