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Nature 's Challenges in Reproducibility initiative Prinz F, Schlange T, Asadullah K (August 2011). "Potential, possible, or probable predatory scholarly open-access publishers". Per the policies of neutral point of view, no original research, and verifiability, Wikipedia articles should be based on reliable, independent, published secondary or tertiary sources. Beall, Jeffrey (25 February 2015). "A practical guide to assigning levels of evidence".

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16 Such articles do not share the reliability of their parent journal. Reviews in particular give a balanced and general perspective of a topic, and are usually easier to understand. 1 (dead link) For medical information, the most useful types of articles are typically labeled "Guideline "Meta-analysis "Practice guideline or "Review". If recent reviews do not mention an older primary source, the older source is dubious.

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