Evaluating the relaxation effects of Shikuwasa (Citrus depressa Hayata) essential oil inhalation in young female adults: Study protocol for a randomised controlled trial by Fumitake Yamaguchi, Naoki Yoshinaga, Miho Kuroki, Rie Nakasone, Hisanori Kenmotsu, Toshio Ueno, Yukihiro Yada, Michikazu Nakai, Yasuji Arimura

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