OBJECTIVE: To evaluate the validity of the Qualis database in identifying the levels of scientific evidence and the quality of randomized controlled trials indexed in the Lilacs database. METHODS: We selected 40 open-access journals and performed a page-by-page hand search. to identify published articles according to the type of study during a period of six years. Classification of st... https://excellentphoto.shop/product-category/mirrorless-lens/