Table 2.

Modified-Jadad score.

	Dossett et al. [18]	Yeo et al. [ 39]	Laende et al. [40]	McEwen et al. [41]	Young et al. [38]
Was the study described as randomized?	Yes	Yes	Yes	Yes	Yes
Was the method of randomization appropriate?	Yes	Yes	Yes	Yes	Yes
Was the study described as blinded?	Yes	Yes	Yes	Yes	Yes
Was the method of blinding appropriate?	Yes	Yes	Yes	Yes	Yes
Was there a description of withdrawals or dropouts?	Yes	Yes	Yes	Yes	Yes
Was there a clear description of the inclusion/exclusion criteria?	Yes	Yes	Yes	Yes	Yes
Was the method used to assess adverse effects described?	Yes	Yes	Yes	Yes	Yes
Was the method of statistical analysis described?	Yes	Yes	Yes	Yes	Yes
Total score	8	8	8	8	8