Review of NASA's Evidence Reports on Human Health Risks: 2016 Letter Report.

This is the fourth in a series of five letter reports that provide an independent review of the more than 30 evidence reports that NASA has compiled on human health risks for long-duration and exploration spaceflights. This letter report reviews eight evidence reports and examines the quality of the evidence, analysis, and overall construction of each report; identifies existing gaps in report content; and provides suggestions for additional sources of expert input.

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