Table 2.

Methodological quality of the controlled trials included in the systematic review (N = 6)

Study	Random assignment	Allocation concealment	Blind	Intention-to-treat analysis
Angerstein et al. [49]	No	No	No	No
Cross et al. [13]	Yes	No	No	No
Klingman [40]	No	No	No	No
Reis and Cornell [41]	No	No	No	No
Tompkins et al. [21]	No	No	No	No
Wyman et al. [29]	Yes	No	No	Yes