Public Opinion and Sentiment Before and at the Beginning of COVID-19 Vaccinations in Japan: Twitter Analysis

Qian Niu   ^{1 *} , MS ;   Junyu Liu   ^{2 *} , ME ;   Masaya Kato   ¹ , MS ;   Yuki Shinohara   ¹ , MS ;   Natsuki Matsumura   ¹ , MS ;   Tomoki Aoyama   ¹ , MD, PhD ;   Momoko Nagai-Tanima   ¹ , PT, PhD

¹ Department of Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan

² Department of Intelligence Science and Technology, Graduate School of Informatics, Kyoto University, Kyoto, Japan

*these authors contributed equally