Table 1 Critical quality appraisal of included articles

Abad-Corpa et al. (2013) [18]

Akosah et al. (2002) [34]

Atienza et al. (2004) [35]

Baldwin, Black & Hammond (2014) [19]

Blue et al. (2001) [30]

Brand et al. (2004) [32]

de la Porte et al. (2007) [36]

Chiu, Shyu & Liu (2001) [38]

Cline et al. (1998) [31]

Coleman et al. (2004) [28]

Coleman et al. (2006) [29]

Cowie et al. (2009) [46]

Dossa, Bokhour & Hoenig (2012) [55]

Farrero et al. (2001) [24]

Grunfeld et al. (1999) [43]

Hanumanthu et al. (1997) [37]

Harrison et al. (2002) [23]

Ireson et al. (2009) [48]

Jeansawang et al. (2012) [27]

Ledwige et al. (2005) [22]

Linden & Butterworth (2014) [20]

Luttik et al. (2014) [41]

Moalosi et al. (2003) [39]

Naithani et al. (2006) [45]

Naylor et al. (2004) [26]

Rauh et al. (1999) [21]

Ricauda et al. (2008) [40]

Sadatsafavi et al. (2013) [42]

Shi et al. (2015) [33]

Vliet Vlietland, Breedveld & Hzaes (1997) [44]

Williams (2003)

Williams, Akroyd and Burke (2010) [25]