Antiviral effect of ephedrine alkaloids-free ephedra herb extract against SARS-CoV-2 in vitro - Uema, M; Hyuga, M; Yonemitsu, K; Hyuga, S; Amakura, Y; Uchiyama, N; Mizoguchi, K; Odaguchi, H; Goda, Y (Microorganisms, 2023)