In vitro suppression of SARS-CoV-2 infection by existing kampo formulas and crude constituent drugs used for treatment of common cold respiratory symptoms - Kakimoto, M; Nomura, T; Nazmul, T; Kitagawa, H; Kanno, K; Ogawa-Ochiai, K; Ohge, H; Ito, M; Sakaguchi, T (Front Pharmacol, 2022)