[1] Osaka Univ, Grad Sch Med, Dept Radiol, 2-2 Yamadaoka, Suita, Osaka 5650871, Japan
[2] Nagoya Univ, Grad Sch Med, Dept Radiol, 65 Tsurumai Cho,Showa Ku, Nagoya, Aichi 4668550, Japan
[3] Keio Univ, Sch Med, Dept Radiol, 35 Shinanomachi,Shinjuku Ku, Tokyo 1600016, Japan
[4] Tokyo Med & Dent Univ, Dept Diagnost Radiol, 1-5-45 Yushima,Bunkyo Ku, Tokyo 1138519, Japan
[5] Shinshu Univ, Sch Med, Dept Radiol, 3-1-1 Asahi, Matsumoto, Nagano 3902621, Japan
[6] Univ Tokyo, Grad Sch Med, Dept Radiol, 7-3-1 Hongo,Bunkyo Ku, Tokyo 1138655, Japan
[7] Univ Tokyo, Fac Med, 7-3-1 Hongo,Bunkyo Ku, Tokyo 1138655, Japan
[8] Juntendo Univ, Grad Sch Med, Dept Radiol, Bunkyo Ku, Tokyo 1138421, Japan
[9] Kyoto Univ, Grad Sch Med, Dept Diagnost Imaging & Nucl Med, 54 Shogoin Kawaharacho,Sakyoku, Kyoto 6068507, Japan
[10] Okayama Univ, Fac Med Dent & Pharmaceut Sci, Dept Radiol, 2-5-1 Shikata Cho,Kita Ku, Okayama 7008558, Japan
[11] Hiroshima Univ, Dept Diagnost Radiol, 1-2-3 Kasumi,Minami Ku, Hiroshima 7348551, Japan
[12] Osaka Metropolitan Univ, Grad Sch Med, Dept Diagnost & Intervent Radiol, 1-4-3 Asahi Machi,Abeno Ku, Osaka 5458585, Japan
[13] Hokkaido Univ Hosp, Dept Diagnost & Intervent Radiol, N15,W5,Kita Ku, Sapporo, Hokkaido 0608638, Japan
[14] Kumamoto Univ, Grad Sch Med, Dept Diagnost Radiol, 1-1-1 Honjo Chuo Ku, Kumamoto 8608556, Japan
[15] Hokkaido Univ, Grad Sch Med, Dept Diagnost Imaging, Kita 15 Nish 7,Kita Ku, Sapporo, Hokkaido 0608648, Japan