Correction: Estimated Sleep Duration Before and During the COVID-19 Pandemic in Major Metropolitan Areas on Different Continents: Observational Study of Smartphone App Data.
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- Record sourced from PubMed, PMID 33617457.
- Also identified by DOI 10.2196/28057 and PMC identifier 7901679.
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Abstract
[This corrects the article DOI: 10.2196/20546.].