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(1) COVID-19 Open Research Dataset (CORD-19). 2020. Version 2021-09-06. Retrieved from https://ai2-semanticscholar-cord-19.s3-us-west-2.amazonaws.com/historical_releases.html. Accessed 2021-09-12. doi:10.5281/zenodo.3715506
(2) Chen Q, Allot A, & Lu Z. (2020) Keep up with the latest coronavirus research, Nature 579:193 and Chen Q, Allot A, Lu Z. LitCovid: an open database of COVID-19 literature. Nucleic Acids Research. 2020. (version 2021-09-12)
(3) Currently tweets of June 26th to 2nd July 2021 have been considered.