An assessment of self-reported COVID-19 related symptoms of 227,898 users of a social networking service in Japan: Has the regional risk changed after the declaration of the state... by Shuhei Nomura, Daisuke Yoneoka, Shoi Shi, Yuta Tanoue, Takayuki Kawashima, Akifumi Eguchi, Kentaro Matsuura, Koji Makiyama, Keisuke Ejima, Toshibumi Taniguchi, Haruka Sakamoto, Hiroyuki Kunishima, Stuart Gilmour, Hiroshi Nishiura, Hiroaki Miyata

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