Table 2.

Newcastle–Ottawa scale for included non-RCT studies

Author	Year	Study design	Selection				Comparability		Outcome			total
			1	2	3	4	1	2	1	2	3
Alex, A.K [12]	2017	Non-RCT	1	1	1	1	1	1	1	1	1	9
Chouhan [13]	2018	Non-RCT	1	1	1	1	1	0	1	1	1	8
des Guetz, G [14]	2007	Non-RCT	1	1	1	1	1	1	0	1	1	8
Drucker, A [15]	2013	Non-RCT	1	1	1	1	1	0	1	1	0	7
Elsaleh, H [16]	2001	Non-RCT	1	1	1	1	1	1	0	1	1	8
Fujiyoshi, K [17]	2017	Non-RCT	1	1	1	1	1	1	1	0	1	8
Guidoboni, M [7].	2001	Non-RCT	1	1	1	1	1	0	1	1	1	8
Hemmink i [18]	2000	Non-RCT	1	1	1	1	1	1	1	1	1	9
Jover [19]	2006	Non-RCT	1	1	1	1	1	0	1	0	1	7
Jung, S.H [20].	2016	Non-RCT	1	1	1	1	1	1	1	1	1	9
Kim, C. G [21].	2016	Non-RCT	1	1	1	1	1	0	1	1	1	8
Kim, J.E [23].	2017	Non-RCT	1	1	1	1	1	1	0	1	1	8
Kim, J.E [22].	2011	Non-RCT	1	1	1	1	1	1	1	1	1	9
Kim, S.H [24].	2013	Non-RCT	1	1	1	1	1	0	1	0	1	7
Lanza, G [44].	2006	Non-RCT	1	1	1	1	1	1	0	1	0	7
Li, P [25].	2017	Non-RCT	1	1	1	1	1	1	1	1	1	9
Liu [26]	2018	Non-RCT	1	1	1	1	1	1	1	1	1	9
Ma, J [27].	2015	Non-RCT	1	1	1	1	1	1	1	1	1	9
Malesci, A [28].	2007	Non-RCT	1	1	1	1	1	0	1	1	0	7
Mohan, H.M [29].	2016	Non-RCT	1	1	1	1	1	1	1	1	1	9
Oh, S.Y [32].	2013	Non-RCT	1	1	1	1	1	0	1	0	1	7
Tan, W. J [37].	2017	Non-RCT	1	1	1	1	1	1	0	1	1	8
Tran, B [38].	2011	Non-RCT	1	1	1	1	1	1	1	1	1	9
Wright, C. M [41].	2000	Non-RCT	1	1	1	1	1	0	1	1	1	8
Zaanan, A [43].	2011	Non-RCT	1	1	1	1	1	1	0	0	0	6
Zaanan, A [42].	2010	Non-RCT	1	1	1	1	1	1	0	1	1	8