1. Department of Cardiology, Hokkaido Cardiovascular Hospital, 1-30, Minami-27, Nishi-13, Chuo-ku, Sapporo 064-8622, Japan
2. Department of Radiology, Jichi Medical University Saitama Medical Center, 1-847 Amanuma-cho, Omiya-ku, Saitama 330-8503, Japan
3. Department of Pathology, JR Sapporo Hospital, Kita-3, Higashi-1, Sapporo 060-0033, Japan
4. Department of Radiology, Hokkaido Cardiovascular Hospital, 1-30, Minami-27, Nishi-13, Chuo-ku, Sapporo 064-8622, Japan