By vgreene, 29 October, 2014 X:Exceptional situations where validating studies cannot be performed, preponderance of benefit over harm
By vgreene, 29 October, 2014 B:Individual cross-sectional studies; RCTs; or consistent evidence from observational studies
By vgreene, 29 October, 2014 A:Systematic review of cross-sectional studies w/ consistently applied reference standard and blinding; well-designed RCTs performed on a population similar to the guideline’s target population
By vgreene, 29 October, 2014 Don't prescribe dietary supplements such as ginkgo, melatonin, zinc, etc. [C]