FIGURE 5 | A hierarchy of evidence.
From the following article:
Development of therapeutics: opportunities within complementary and alternative medicine
Linda W. Engel & Stephen E. Straus
Nature Reviews Drug Discovery 1, 229-237 (March 2002)
doi:10.1038/nrd750
The National Center for Complementary and Alternative Medicine (NCCAM) relies on evidence-based reviews to help identify areas for clinical investigation. The information regarding the efficacy and safety of complementary and alternative medicine (CAM) therapies spans a continuum that ranges from anecdotes and retrospective studies to small randomized controlled (Phase II) clinical trials, and Phase III trials.
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