[1] KEIO UNIV,SCH MED,DEPT PEDIAT,TOKYO,JAPAN
[2] JUNTENDO UNIV,URAYASU HOSP,SCH MED,URAYASU,CHIBA,JAPAN
[3] KITASATO UNIV,SCH MED,DEPT PEDIAT,SAGAMIHARA,KANAGAWA 228,JAPAN
[4] GUNMA UNIV,FAC EDUC,DEPT SPECIAL EDUC HANDICAPPED,MAEBASHI,GUMMA 371,JAPAN