Table S3. Quality assessment of included studies according to the NOS scores Outcome Risk of bias Reference Year Selection Comparablity Scores Assessment (NOS) Xi et al. 2010 2010 * * * * * * * ******* 7 Jain et al. 2009 2009 * * * * * * ****** 6 Perez-Padilla 2009 * * * * * * * * ******** 8 et al. 2009 Kandun et al. 2006 * * * * * * ****** 6 2008 Chien et al. 2009 * * * * * * ****** 6 2010 Martin-Loeches 2010 * * * * * * * ******* 7 et al.2011 Brun-Buisson 2011 * * * * * * * * ******** 8 et al.2011 Kim et al. 2011 2011 * * * * * * * ******* 7 Chotpitayasunondh 2005 * * * * * * ****** 6 et al. 2005 Hien et al. 2009 * * * * * * ****** 6 2009 Liem et al. 2009 * * * * * * ****** 6 2009 Viasus et al. 2011 * * * * * * * ******* 7 2011 Kudo et al. 2011 * * * * * * ****** 6 2012 Han et al. 2011 * * * * * * * ******* 7 2011 Chawla et al. 2013 * * * * * * ****** 6 2013 Rodríguez 2011 * * * * * * ****** 6 et al.2011 Diaz et al. 2012 2012 * * * * * * * ******* 7 Hu et al. 2013 * * * * * * ****** 6 2013 Lee et al. 2015 2015 * * * * * * * * ******** 8 Interpretations: NOS, Newcastle-Ottawa Scale.
Table S3. Quality assessment of included studies according to the NOS scores Reference Year Selection Comparablity Outcome Assessment Scores Risk of bias (NOS) Xi et al. 2010 2010 * * * * * * * ******* 7 Jain et al. 2009 2009 * * * * * * ****** 6 Perez-Padilla et al. 2009 2009 * * * * * * * * ******** 8 Kandun et al. 2008 2006 * * * * * * ****** 6 Chien et al. 2010 2009 * * * * * * ****** 6 Martin-Loeches et al.2011 2010 * * * * * * * ******* 7 Brun-Buisson et al.2011 2011 * * * * * * * * ******** 8 Kim et al. 2011 2011 * * * * * * * ******* 7 Chotpitayasunondh et al. 2005 2005 * * * * * * ****** 6 Hien et al. 2009 2009 * * * * * * ****** 6 Liem et al. 2009 2009 * * * * * * ****** 6 Viasus et al. 2011 2011 * * * * * * * ******* 7 Kudo et al. 2012 2011 * * * * * * ****** 6 Han et al. 2011 2011 * * * * * * * ******* 7 Chawla et al. 2013 2013 * * * * * * ****** 6 Rodríguez et al.2011 2011 * * * * * * ****** 6 Diaz et al. 2012 2012 * * * * * * * ******* 7 Hu et al. 2013 2013 * * * * * * ****** 6 Lee et al. 2015 2015 * * * * * * * * ******** 8 Interpretations: NOS, Newcastle-Ottawa Scale.