[1] JICHI MED SCH,DIV IMMUNOL,MINAMIKAWACHI,TOCHIGI 32904,JAPAN
[2] TOKYO METROPOLITAN INST MED SCI,DIV HEPATITIS,TOKYO 113,JAPAN
[3] KYUSHU UNIV,DEPT AGR,FUKUOKA,JAPAN
[4] UNIV TOKYO,INST IMMUNOL,TOKYO 113,JAPAN
[5] UNIV TOKYO,DEPT INTERNAL MED 3,TOKYO 113,JAPAN
[6] JAPAN RED CROSS,BLOOD CTR,TOKYO,JAPAN