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How did outdoor biking and walking change during COVID-19?: A case study of three U.S. cities
- Annie Doubleday,
- Youngjun Choe,
- Tania Busch Isaksen,
- Scott Miles,
- Nicole A. Errett
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- Published: January 20, 2021
- https://doi.org/10.1371/journal.pone.0245514