Long time back, physicians knew little but were still confident in making definitive and often irreversible decisions. Today, we know much more and what we truly know is how little we really understand things and how our once obvious decisions may in the long run prove not to be supported by data. The philosophy of modem scientific medicine is based on the concepts of evidence and revision. Unlike other forms of thought and belief, which can have as their chief tenets, the concepts of absolute faith and unquestioning adherence, the practice of medicine has evolved and expanded in efficacy, in large part because we actively sought out data over assertion and belief and are willing to challenge and revise what we believe to be correct. The review by Yang, Disandro, and Baskin reflects our current momentary grasp of the situation.
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