Can it really be true that 50% of research is unpublished?

The BMJ, 5 June 2017
By Paul Glasziou and Iain Chalmers

http://blogs.bmj.com/bmj/2017/06/05/paul-glasziou-and-iain-chalmers-can-it-really-be-true-that-50-of-research-is-unpublished/

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