[1] NATL CHILDRENS HOSP,DEPT NEUROL,TOKYO 154,JAPAN
[2] HOKKAIDO UNIV,SCH MED,DEPT PEDIAT,SAPPORO,HOKKAIDO 060,JAPAN
[3] TOHOKU UNIV,SCH MED,DEPT BACTERIOL,SENDAI,MIYAGI 980,JAPAN
[4] UNIV TOKYO,FAC MED,DEPT PEDIAT,TOKYO 113,JAPAN
[5] JUNTENDO UNIV,SCH MED,DEPT NEUROL,TOKYO 113,JAPAN
[6] NATL CTR NERVOUS MENTAL & MUSCULAR DISORDERS,DIV MENTAL RETARDAT & BIRTH DEFECT RES,KODAIRA,TOKYO 187,JAPAN
[7] OSAKA UNIV,SCH MED,DEPT PEDIAT,OSAKA,JAPAN
[8] OSAKA UNIV,MICROBIAL DIS RES INST,DEPT PATHOL,SUITA,OSAKA 565,JAPAN
[9] OKAYAMA UNIV,SCH MED,INST NEUROBIOL,DEPT DEV NEUROSCI & CHILD NEUROL,OKAYAMA 700,JAPAN
[10] TOTTORI UNIV,SCH MED,INST NEUROL SCI,DIV CHILD NEUROL,YONAGO,TOTTORI 683,JAPAN
[11] KYUSHU UNIV,FAC MED,INST NEUROL,DEPT PEDIAT,FUKUOKA,JAPAN
[12] KYUSHU UNIV,FAC MED,INST NEUROL,DEPT NEUROPATHOL,FUKUOKA,JAPAN
[13] TOKYO MED & DENT UNIV,MED RES INST,DEPT CLIN PHARMACOL,TOKYO 113,JAPAN