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  1. S Singh,
  2. C D Furberg
  1. Wake Forest University, North Carolina, USA
  1. Dr S Singh, One Medical Center Blvd, Section of General Internal Medicine, Winston-Salem, NC 27157, USA; sosingh{at}

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There is growing consensus that the practice of medicine should be evidence-based. The preferred method for obtaining evidence about the efficacy and safety of …

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  • Competing interests: None.

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