Table 3.

Quality assessment of non-RCTs

	Methods of grouping	Methods of blinding	Inclusion of all patients	Baselines	Standards of diagnosis	Control of confounding factors	Selective reporting	Total score
El Gendy NM (2012)	0	0	0	2	2	1	2	7
Goulet RJ (2008)	0	0	2	2	2	2	2	10
Tsai JC (2006)	0	0	2	2	2	1	0	7
Tesser R (2005)	0	0	2	2	2	0	2	8
Chung AN (2004)	0	0	0	1	2	0	2	5
Syed HM (2004)	0	0	1	2	2	1	1	7
Wang JC (2004)	0	0	1	2	2	0	2	7
Beck AD (2003)	0	0	2	1	2	0	1	6