Selection Comparability Outcome Score
Parvini et al. [26] ★☆★★ ☆☆ ★★★ 6/9
Schwarz et al. [27] ★☆★★ ☆☆ ★★★ 6/9
Angermair et al. [28] ★☆★★ ☆☆ ★★★ 6/9
Di Stefano et al. [29] ★☆★★ ☆☆ ★★★ 6/9
Ortiz-Vigón et al. [30] ★☆★★ ☆☆ ★★★ 6/9

0 to 3 stars = low-quality; 4 to 6 stars = moderate quality; 7 to 9 stars = high quality.