Serologic Survey of IgG Against SARS-CoV-2 Among Hospital Visitors Without a History of SARS-CoV-2 Infection in Tokyo, 2020–2021 oleh Takahiro Sanada, Tomoko Honda, Fumihiko Yasui, Kenzaburo Yamaji, Tsubasa Munakata, Naoki Yamamoto, Makoto Kurano, Yusuke Matsumoto, Risa Kohno, Sakiko Toyama, Yoshiro Kishi, Takuro Horibe, Yudai Kaneko, Mayumi Kakegawa, Kazushige Fukui, Takeshi Kawamura, Wang Daming, Chungen Qian, Fuzhen Xia, Fan He, Syudo Yamasaki, Atsushi Nishida, Takayuki Harada, Masahiko Higa, Yuko Tokunaga, Asako Takagi, Masanari Itokawa, Tatsuhiko Kodama, Michinori Kohara