Table 2

Evaluation of literature quality

ID	Author	Year	The Cochrane risk of bias assessment							Jadad scoring	ITT
ID	Author	Year	Random sequence generation	Allocation concealment	Blinding of participants and personnel	Blinding of outcome assessment	Incomplete outcome data	Selective reporting	Other bias	Jadad scoring	ITT
1	Roman et al26	2018	Low	Low	Low	Unclear	Low	Low	Low	7	No
2	Farhangi et al21	2018	Low	Low	Low	Unclear	Low	Low	Low	5	No
3	Schumann et al22	2018	Low	High	High	Low	Low	Unclear	Unclear	5	Yes
4	Sawada et al17	2017	Low	Unclear	Unclear	Unclear	Unclear	Unclear	Low	3	No
5	Sanchez et al23	2017	Unclear	Unclear	Unclear	Unclear	Low	Unclear	Low	4	No
6	Romijn et al26	2017	Low	Low	Low	Unclear	Low	Unclear	Low	7	Yes
7	Pinto-Sanchez et al18	2017	Low	Low	Low	Unclear	Low	Unclear	Low	7	Yes
8	Kelly et al20	2017	Low	Unclear	Low	Unclear	Unclear	Unclear	Unclear	3	No
9	Eswaran et al28	2017	Low	Unclear	High	Low	Unclear	Unclear	Unclear	2	Yes
10	Colica et al29	2017	Low	Unclear	Unclear	Unclear	Low	Unclear	Unclear	3	No
11	Azpiroz et al30	2017	Low	Unclear	Unclear	Unclear	Low	Unclear	Low	5	Yes
12	Lyra et al31	2016	Low	Low	Low	Low	Low	Unclear	Unclear	7	Yes
13	Steenbergen et al32	2015	Low	Unclear	Unclear	Unclear	Low	Unclear	Unclear	4	No
14	Lorenzo-Zúñiga et al33	2014	Low	Low	Low	Unclear	Low	Unclear	Unclear	6	No
15	Peters et al34	2014	Low	Unclear	Unclear	Low	Low	High	Unclear	5	No
16	Alipour et al35	2014	Low	Low	Low	Unclear	Low	Unclear	Unclear	7	No
17	Yuman and Yingwei36	2013	Low	Low	Low	Unclear	Unclear	Unclear	Unclear	6	No
18	Messaoudi et al19	2011	Low	Low	Low	Unclear	Low	Unclear	Unclear	7	No
19	Simrén et al37	2010	Low	Low	Low	Low	Low	Unclear	Unclear	7	Yes
20	Silk et al38	2009	Low	Unclear	Unclear	Unclear	Low	Unclear	Unclear	5	No
21	Rao et al39	2009	Low	Unclear	Low	Unclear	Low	Unclear	Unclear	5	No

ITT, intent to treat.