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| 2009/04/25 23:56:39瀏覽613｜回應0｜推薦3 | |
Level 1: Randomized control trials (RCT), Meta-analysis, Systematic reviews, Sensitivity and specificity (for diagnosis literature) Level 2: Cohort studies Level 3: Case control studies Level 4: Case series, Cross sectional surveys Level 5: Expert opinions |
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