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(1) COVID-19 Open Research Dataset (CORD-19). 2020. Version 2020-11-16. Retrieved from https://ai2-semanticscholar-cord-19.s3-us-west-2.amazonaws.com/historical_releases.html. Accessed 2020-11-16. doi:10.5281/zenodo.3715506
(2) Chen Q, Allot A, & Lu Z. (2020) Keep up with the latest coronavirus research, Nature 579:193 (version 2020-11-16)
(3) Currently tweets of May 2020 have been considered based on v1.8 (to be updated).