[1] TOHOKU UNIV,SCH MED,DEPT RADIAT RES,AOBA KU,SENDAI,MIYAGI 98077,JAPAN
[2] TOHOKU UNIV,SCH MED,DEPT NEUROSURG,SENDAI,MIYAGI 980,JAPAN
[3] TOHOKU UNIV,SCH MED,DEPT FORENS MED,SENDAI,MIYAGI 980,JAPAN
[4] TOHOKU UNIV,SCH MED,DEPT PATHOL,SENDAI,MIYAGI 980,JAPAN
[5] KYOTO PHARMACEUT UNIV,DEPT ANALYT CHEM,KYOTO,JAPAN