Table 5. Quality assessment score according to the Newcastle-Ottawa scale.

Selection: representativeness of studies (maximum score of 4); Comparability: comparability of studies based on the design or analysis or analysis (maximum score of 1); Outcome: assessment of outcome and follow-up (maximum score of 3); Studies with a total score of 6-8 were considered high quality while 1-5 were low-quality ones.

Study ID	Selection	Comparability	Outcome	Total score
Alavi-Moghaddam et al., 2013 [20]	4	1	3	8
Ozkan et al., 2020 [21]	4	1	3	8
Bahlis et al., 2021 [2]	4	1	3	8
Ronda et al., 2021 [22]	4	1	3	8
Feng et al., 2021 [3]	4	1	3	8
Neto et al., 2021 [6]	4	0	3	7
Estella, 2015 [23]	3	0	2	5
Demirel, 2018 [24]	1	1	3	5
Holten et al., 2020 [25]	4	1	3	8
Olivia et al., 2021 [26]	4	0	2	6
Cupurdija et al., 2015 [27]	4	1	3	8
Anurag and Preetam, 2021 [5]	4	1	3	8
Ranzani et al., 2017 [28]	4	1	2	7
Günaydın et al., 2019 [29]	4	0	3	7
Tsai et al., 2021 [30]	4	0	3	7
Wen et al., 2020 [31]	4	0	2	6
Putot et al., 2016 [7]	4	1	3	8
Wang et al., 2020 [32]	4	1	3	8
Bloom et al., 2019 [33]	4	0	1	5
Williams et al., 2018 [34]	4	0	3	7
Kim et al., 2013 [10]	4	1	2	7
Aydin et al., 2019 [35]	4	0	3	7
Akpınar et al., 2019 [36]	4	1	3	8
Ito et al., 2017 [37]	4	0	3	7
Lee et al., 2013 [38]	4	1	3	8