[1] Tohoku Univ, Grad Sch Med, Dept Cardiovasc Med, Sendai, Miyagi, Japan
[2] Tohoku Univ, Tohoku Med Megabank Org, Sendai, Miyagi, Japan
[3] Imperial Coll London, Dept Med, Div Brain Sci, London, England
[4] Natl Cerebral & Cardiovasc Ctr, Suita, Osaka, Japan
[5] Int Univ Hlth & Welf, Narita 2868686, Japan