An article in PLoS ONE by John Ioannidis and colleagues noted that that not enough journals have policies on data availability, and that authors don't adhere to policies that are in place. The article was the focus of a news story in Nature, which also addressed the need for better standards and incentives to share, both of which could address the question of why scientists don't share more. Focusing on clinical data, The Cochrane Collaboration issued a statement calling for free access to all data from clinical trials, to avoid selective reporting and ultimately reducing risks for patients.
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