scientific article
author: Asahi Hishida, Isao Oze, Tanvir Turin, Motahare Kheradmand, Nobuyuki Hamajima, Michiaki Kubo, Kenji Wakai, Mariko Naito, Sayo Kawai, Sadao Suzuki, Haruo Mikami, Keizo Ohnaka, Kokichi Arisawa, Takeshi Imaizumi, Yoshiyuki Watanabe