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

Table 3 Quality assessment of random controlled studies in the meta-analysis based on the Cochrane Handbook version 5.1.0

Ref.	Random sequence generation	Allocation concealment	Blinding of participants and personnel	Blinding of outcome assessment	Incomplete outcome data	Selective reporting	Other sources of bias
Rawlings et al[17], 2012	Low	Unclear	High	Low	Low	Low	Unclear
Rebecchi et al[18], 2008	Low	Low	High	Low	Low	Low	Unclear
Richards et al[19], 2004	Low	Low	Low	Low	Low	Low	Unclear
Simić et al[21], 2010	Low	Low	High	High	Unclear	low	Unclear
Torquati et al[23], 2006	Low	Low	Low	Low	Low	Low	Unclear