Table 1.

Quality assessment of the included studies according to the Newcastle–Ottawa scale.

References	Selection	Comparability	Outcome	Total
Kubota et al. [15]	3	2	4	9
Kubota et al. [9]	3	2	4	9
Tarantino et al. [10]	3	1	4	8
Sys et al. [16]	3	1	4	8
Land et al. [17]	4	1	4	9
Tsai et al. [18]	4	1	3	8
Hartmann et al. [11]	4	2	3	9
Feiz-Erfan et al. [12]	4	2	3	9
Jenis et al. [14]	4	1	3	8
Carreon et al. [13]	4	2	3	9
Castro[19]	4	2	3	9
Hee et al. [20]	4	2	3	9
Weiner and walker [21]	4	2	3	9
Imagama et al. [2]	4	2	3	9