[1] Hokkaido Cardiovasc Hosp, Dept Cardiol, Chuo Ku, 1-30 Minami 27,Nishi 13, Sapporo, Hokkaido 0648622, Japan
[2] Jichi Med Univ, Saitama Med Ctr, Dept Radiol, Omiya Ku, 1-847 Amanuma Cho, Saitama 3308503, Japan
[3] JR Sapporo Hosp, Dept Pathol, Kita 3,Higashi 1, Sapporo, Hokkaido 0600033, Japan
[4] Hokkaido Cardiovasc Hosp, Dept Radiol, Chuo Ku, 1-30 Minami 27,Nishi 13, Sapporo, Hokkaido 0648622, Japan