Table 2 Quality assessment of included studies

Soares, 2006 [15]

Yes

Yes

Yes

Serrato, 2007 [16]

Yes

Yes

Yes

Ledoux, 2008 [34]

Yes

Yes

Yes

Duke, 2008 [26]

Yes

Yes

Yes

Tsai, 2008 [31]

Yes

No

Yes

Sakr, 2008 [35]

Yes

Yes

Yes

Metnitz, 2009 [36]

Yes

Yes

Yes

Capuzzo, 2009 [39]

Yes

Yes

Yes

Strand, 2009 [37]

Yes

Yes

Yes

Alves, 2009 [17]

Yes

Yes

Yes

Mbongo, 2009 [40]

Yes

Yes

Yes

Poole, 2009 [41]

Yes

Yes

Yes

Maccariello, 2010 [18]

Yes

No

Yes

Silva Junior, 2010 [19]

Yes

Yes

Yes

Khwannimit, 2010 [27]

Yes

Yes

Yes

Soares, 2010 [20]

Yes

Yes

Yes

Khwannimit, 2011 [28]

Yes

Yes

Yes

Lim, 2011 [32]

Yes

Yes

Yes

Costa e Silva, 2011 [21]

Yes

No

Yes

Christensen, 2011 [38]

Yes

NR

Yes

Juneja, 2012 [29]

Yes

Yes

Yes

Nassar Junior, 2012 [22]

Yes

Yes

Yes

Keegan, 2012 [25]

Yes

Yes

Yes

Nassar Junior, 2013 [23]

Yes

Yes

Yes

De Oliveira, 2013 [24]

Yes

Yes

Yes

Khwannimit, 2013 [30]

Yes

Yes

Yes

Lim, 2013 [33]

Yes

Yes

Yes

López-Caler, 2013 [42]

No

Yes

Yes