Table 2. Quality of the studies according to GRADE criteriaa: randomized clinical trials.

First author/Year of publication	Proper sequence of data generation	Allocation concealment	Blinding	Description of losses and exclusions	Analysis by intention to treat	Score
Agyapong et al (2012)1	Yes	Yes	Yes	Yes	Yes	5/5
Blankers et al (2011)5	Yes	Yes	No	Yes	Yes	4/5
Joseph et al (2011)28	Yes	Yes	Yes	Yes	Yes	5/5
McKay et al (2011)34	Yes	Yes	Yes	Yes	Yes	5/5
Postel et al (2011)38	No	No	No	Yes	No	1/5
Whittaker et al (2011)48	Yes	Yes	Yes	Yes	Yes	5/5
Fernandes et al (2010)18	Yes	No	No	Yes	No	2/5
Girard et al (2010)20	No	No	No	Yes	Yes	2/5
Zanjani et al (2010)49	Yes	Yes	No	Yes	Unclear	3/5
Eberhard et al (2009)15	No	No	No	No	Yes	1/5
Kavanagh & Connolly (2009)30	Yes	Yes	Yes	Yes	Yes	5/5
Kay-Lambkin et al (2009)31	Yes	Yes	No	Yes	Yes	4/5
Litt et al (2009)33	No	No	No	Yes	Unclear	1/5
Brendryen et al (2008)6	Yes	Yes	Yes	Yes	Yes	5/5
El-Khorazaty et al (2007)16	No	No	No	Yes	Yes	2/5
Hubbardi et al (2007)26	Yes	Yes	No	Yes	Yes	4/5
Parker et al (2007)37	No	No	No	Yes	Yes	2/5
Vidrine et al (2006)47	No	No	No	Yes	No	1/5
Currie et al (2004)11	No	No	No	Yes	No	1/5
Hall & Hubert (2000)23	No	No	No	No	No	0/5

^a GRADE study quality questionnaire, Guyatt GH et al (2008).