[1] Nagasaki Univ, Grad Sch Biomed Sci, Dept Internal Med 1, Nagasaki 8528501, Japan
[2] Nagasaki Univ, Ctr Hlth & Community Med, Nagasaki 8528501, Japan
[3] Nagasaki Univ, Grad Sch Hlth Sci, Nagasaki 8528501, Japan
[4] Kyushu Univ, Grad Sch Med Sci, Dept Neuropathol, Neurol Inst, Fukuoka 812, Japan