Fewer than half of registered trials publish their results.
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References
Mathieu, S., Boutron, I., Moher, D., Altman, D. G. & Ravaud, P. J. Am. Med. Assoc. 302, 977–984 (2009).
Ross, J. S., Mulvey, G. K., Hines, E. M., Nissen, S. E. & Krumholz, H. M. PLoS Med. 6, e1000144 (2009).
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Dolgin, E. Publication bias continues despite clinical-trial registration. Nature (2009). https://doi.org/10.1038/news.2009.902
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DOI: https://doi.org/10.1038/news.2009.902