Safety and Efficacy of Ephedrine Alkaloids-Free Ephedra Herb Extract (EFE) for Mild COVID-19: A Double-Blind, Placebo-Controlled, Randomized Comparative Trial by Hiroshi Odaguchi, Sumiko Hyuga, Mariko Sekine, Hirofumi Michimae, Masashi Hyuga, Nahoko Uchiyama, Masashi Uema, Yuji Kumagai, Yusuke Suzuki, Shigeki Nabeshima, Norio Omagari, Yohei Doi, Kunihiro Yamaoka, Koji Miyazaki, Susumu Fuji, Yoshihiro Umezawa, Shiho Kodera, Hirotaka Nagashima, Wataru Hirose, Yukihiro Goda

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