Study Year of
publication 		Selection
(maximum 4 stars) 		Comparability
(maximum 2 stars) 		Outcome
(maximum 3 stars) 		Total score/
quality
Misch et al [24] 1997 ★★★★ ★★ ☆★☆ 7 stars/high quality
Cordaro et al. [25] 2002 ★★★★ ★★ ☆★☆ 7 stars/high quality
Clavero et al. [26] 2003 ★★★★ ★★ ☆★☆ 7 stars/high quality
Silva et al. [27] 2006 ★★★★ ★★ ☆★☆ 7 stars/high quality
Raghoebar et al. [28] 2007 ★★★★ ★★ ☆★☆ 7 stars/high quality
Andersson et al. [29] 2008 ★★★★ ★★ ☆★☆ 7 stars/high quality
Cordaro et al. [30] 2011 ★★★★ ★★ ★★★ 9 stars/high quality
Altiparmak et al. [31] 2015 ★★★★ ★★ ☆★☆ 7 stars/high quality
Ersanli et al. [32] 2016 ★★★★ ★★ ☆★☆ 7 stars/high quality
Pereira et al. [33] 2019 ★★★★ ★★ ☆★☆ 7 stars/high quality