A novel highly quantitative and reproducible assay for the detection of anti-SARS-CoV-2 IgG and IgM antibodies oleh Kenta Noda, Kouki Matsuda, Shigehiro Yagishita, Kenji Maeda, Yutaro Akiyama, Junko Terada-Hirashima, Hiromichi Matsushita, Satoshi Iwata, Kazuto Yamashita, Yusuke Atarashi, Shunsuke Watanabe, Nobuyuki Ide, Tomokazu Yoshida, Norio Ohmagari, Hiroaki Mitsuya, Akinobu Hamada