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Basic learning concepts in EBM: the bidimentional hierarchy of evidence

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  • Correction notice This article has been corrected since it was published Online First. The Acknowledgement statement has been updated to thank Mr Gagnon for his proofreading and revising work.

  • Acknowledgement The author acknowledge the contributions of Professor Brian Haynes and Sir Iain Chalmers for their precious advice and Mr Rusty Gagnon for his proofreading and revising work.

  • Competing interests None.

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