scientific article
author: Isao Oze, Rieko Okada, Chisato Nagata, Nobuyuki Hamajima, Michiaki Kubo, Kenji Wakai, Naoyuki Takashima, Sadao Suzuki, Haruo Mikami, Kokichi Arisawa, Nagato Kuriyama, Keitaro Tanaka, Etsuko Ozaki, Daisuke Matsui, Teruhide Koyama, Akie Hirata, Keiichi Shimatani