Table 2. Risk of bias in the randomized controlled trials.

Authors	Allocation Sequence Described	Intention To Treat Analysis	Blinding			Handling Of Missing Data
			Patient	Personnel	Assessor
Schlitt et al (2001)14	No	Yes	Yes	No	No	Unclear
Simone et al (2009)15	Yes	Yes	No	No	No	Unclear
Cicinnati et al (2007)16	No	Yes	No	No	No	Unclear
Beckebaum et al (2004)17	No	No	No	No	No	Unclear
Pageaux et al (2006)18	No	No	No	No	No	Unclear
Eisenberger et al (2009)19	Yes	No	No	No	No	Unclear
Rogers et al (2009)20	No	No	No	No	No	Unclear
Biselli et al (2009)21	No	No	No	No	No	Unclear
Shenoy et al (2007)22	Yes	No	No	No	No	Last Value Forward
Beckbaum et al (2009)23	No	No	No	No	No	Unclear