Assessors were required to answer "yes" score or any other scores for each of items (AMSTAR and OQAQ). If an item was scored "yes," it would be given one point, otherwise, 0 point. We added up these to calculate a total score, the reliability of this total score was assessed through calculating intraclass correlation coefficients; the agreement for each item and the overall tool was explained by percentage of actual agreement as well as Kappa coefficient [5, 8] . Kappa coefficient is a popular measure for chance-corrected nominal scale agreement between two raters. We adopted the Kappa values of <0 rates as less than chance agreement, 0.01-0.20 as slight agreement, 0.21-0.40 as fair agreement, 0.41-0.60 as moderate agreement, 0.61-0.80 as substantial agreement, and 0.81-0.99 as almost perfect agreement [8] .