Recent Declining Trend of Incidence Rate of Subarachnoid Hemorrhage in Shimane, Japan: The Japan Incidence of Subarachnoid Hemorrhage (JIS) Study oleh Shingo MATSUDA, Fusao IKAWA, Toshikazu HIDAKA, Shuhei YAMAGUCHI, Tetsuji INAGAWA, Nobutaka HORIE, Kaoru KURISU, Yasuhiko AKIYAMA, Yoshihito GOTO, Takeo NAKAYAMA, Hitoshi FUKUDA, Tetsuya UEBA, Masahiro SASAKI, Tatsuya ISHIKAWA, Norihito SHIMAMURA, Hiroki OHKUMA, JIS study group