[Source](https://fermatslibrary.com/s/sleep-and-mortality-a-population-based-22-year-follow-up-study "Permalink to 
Fermat's Library | Sleep and Mortality: A Population-Based 22-Year Follow-Up Study annotated/explained version.
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Fermat's Library | Sleep and Mortality: A Population-Based 22-Year Follow-Up Study annotated/explained version.