TABLE 3.

Quality appraisal for non-randomized trials.

Authors (year)	Confounding	Selection of participants	Classification of interventions	Deviations from intended interventions	Missing data	Measurement of outcomes	Selection of reported result
Arnason and Kerry (19)	Low	Low	Low	Low	Low	Low	Low
Parr et al. (17)	Low	Low	Low	Low	Low	Low	Low