Guidelines	Systematic reviews	RCTs
1 guideline.pt 2 practice guideline.pt 3 exp guidelines/ 4 health planning guidelines/ 5 or/1‐4	1 meta‐analysis/ 2 exp review literature/ 3 (meta‐analy$ or meta analy$ or metaanaly$).tw 4 meta analysis.pt 5 review academic.pt 6 review literature.pt 7 letter.pt 8 review of reported cases.pt 9 historical article.pt 10 review multicase.pt 11 or/1‐6 12 or/7‐10 13 11 not 12	1 randomized controlled trial.pt 2 controlled clinical trial.pt 3 randomized controlled trials/ 4 random allocation/ 5 double blind method/ 6 or/1‐5 7 clinical trial.pt 8 exp clinical trials/ 9 ((clin$ adj25 trial$)).ti, ab 10 ((singl$ or doubl$ or trebl$ or tripl$) adj25 (blind$ or mask$)).ti, ab 11 placebos/ 12 placebos.ti, ab 13 random.ti, ab 14 research design/ 15 or/7‐14 16 comparative study/ 17 exp evaluation studies/ 18 follow up studies/ 19 (control$ or prospectiv$ or volunteer$)).ti, ab 20 prospective studies/ 21 or/16‐20 22 6 or 15 or 21