1. Department of Surgery, National Tosei Hospital, 762-1 Nagasawa, Shimizu-cho, Sunto-gun, Shizuoka-ken 411, Japan
2. Department of Cardiovascular Surgery, National Tosei Hospital, 762-1 Nagasawa, Shimizu-cho, Sunto-gun, Shizuoka-ken 411, Japan
3. Department of Radiology, National Tosei Hospital, 762-1 Nagasawa, Shimizu-cho, Sunto-gun, Shizuoka-ken 411, Japan