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Acknowledgements
The editors are grateful to:
Elsevier Ltd. for making a pdf of this article available (letter to Iain Chalmers from Laura Pritchard, 14 May 2014). For conditions of further reproduction, see here.
Moher D, Pham B, Jones A, Cook DJ, Jadad AR, Moher M, Tugwell P, Klassen TP (1998)
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