1 Department of Cardiovascular Medicine, National Cerebral and Cardiovascular Center, 6-1 Kishibeshimmachi, Suita, Osaka, 564-8565, Japan. yonedashuichi1976@ncvc.go.jp.
2 Department of Cardiovascular Medicine, National Cerebral and Cardiovascular Center, 6-1 Kishibeshimmachi, Suita, Osaka, 564-8565, Japan.