This article has now been updated. Please use the final version.
Department of Cardiovascular Surgery, Tokyo Medical University [Japan]
Cardiovascular Center, Kansai Rosai Hospital [Japan]
Cardiovascular Medicine, Nippon Medical School Hospital [Japan]
Department of Cardiology, Mito Saiseikai General Hospital [Japan]
Department of Radiology, Nippon Medical School [Japan]
Department of Pathology, National Cerebral and Cardiovascular Center [Japan]
Department of Cardiovascular Medicine, Kansai Electric Power Hospital [Japan]