A double-blind, randomized, crossover comparative study for evaluating the clinical safety of ephedrine alkaloids-free Ephedra Herb Extract (EFE) - Odaguchi, H; Sekine, M; Hyuga, S; Hanawa, T; Hoshi, K; Sasaki, Y; Aso, M; Yang, J; Hyuga, M; Kobayashi, Y; Hakamatsuka, T; Goda, Y; Kumagai, Y (Evid Based Complement Alternat Med, 2018)