Table 4.

Assessment of the quality of the studies.

Reference	Treatment quality		Methodological quality		Overall quality
	Rater 1	Rater 2	Rater 1	Rater 2	Rater 1	Rater 2
[22]	7	6	15	14	22	20
[23]	8	7	12	11	20	18
[24]	9	9	17	14	26	23
[25]	9	9	25	25	34	34
[26]	8	8	26	26	34	34
[27]	7	6	26	24	33	30
[28]	7	8	23	23	30	31
[29]	8	8	21	22	28	30
[30]	8	9	23	22	30	31
[31]	9	8	25	24	34	32
[32]	7	8	26	26	33	34