1.randomized controlled trial.pt.
2.controlled clinical trial.pt.
3.double-blind method/ or random allocation/ or single-blind method/
4.exp Clinical Trial/
5.exp clinical trials as topic/
6.clinical trial.pt.
8.((clinical$ or control$) adj3 trial$).ti,ab.
9.((singl$ or doubl$ or trebl$ or tripl$) adj5 (blind$ or mask$)).ti,ab.
10.Placebos/ or placebo$.ti,ab.
11.(volunteer$ or "control group" or controls).ti,ab.
13.cross-over studies/
14.((crossover or cross-over or cross over) adj2 (design$ or stud$ or procedure$ or trial$)).ti,ab.
15.12 or 13 or 14
16.Research Design/ or Comparative studies/
17.exp Evaluation studies/ or evaluation studies as topic/
18.exp Cohort Studies/
19.exp Case-Control Studies/ or control groups/
20.exp Cross-Sectional Studies/
21.(case control or case-control).ti,ab.
22.(cross-sectional or cross sectional).ti,ab.
23.((observ$ or cohort$ or follow-up or follow up or longitudinal or prospective or retrospective or comparative) adj1 (stud$ or research or analys$)).ti,ab.

From: Appendix D, Literature search strategies

Cover of Stable Angina
Stable Angina: Methods, Evidence & Guidance [Internet].
NICE Clinical Guidelines, No. 126.
National Clinical Guidelines Centre (UK).
Copyright © 2011, National Clinical Guidelines Centre.

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