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We built a large corpus by collecting Korean tweets mentioning COVID-19 vaccine brands (eg, Pfizer, Moderna, Astra Zeneca, Janssen, and Novavax), via academic research access [31] authorized by Twitter, posted from February 2021 to March 2022. We removed emoticons from the collected documents before subsequent preprocessing and then constructed an initial corpus with 1,689,158 tweets.
In turn, we preprocessed the initial corpus through a series of steps from stemming through short-tweet elimination.
J Med Internet Res 2023;25:e42623
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By late February 2021, the Pfizer-Bio NTech (Pfizer), Moderna, and Johnson & Johnson (J&J/Janssen) vaccines were all approved for emergency use authorization. The Pfizer and Moderna vaccination drives started much earlier, in late December (Figures S2 and S3 in Multimedia Appendix 1), as compared to that of the Janssen vaccines, which also saw a stall in vaccine rates in mid-April (Figure S4 in Multimedia Appendix 1).
JMIR Public Health Surveill 2022;8(11):e38898
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