[1] HIROSHIMA UNIV,SCH MED,INST PHARMACEUT SCI,MINAMI KU,HIROSHIMA 734,JAPAN
[2] GRAD UNIV ADV STUDIES,DEPT SYNCHROTRON RADIAT SCI,TSUKUBA,IBARAKI 305,JAPAN
[3] NATL LAB HIGH ENERGY PHYS,PHOTON FACTORY,TSUKUBA,IBARAKI 305,JAPAN
[4] SCI UNIV TOKYO,FAC SCI & TECHNOL,DEPT ELECT ENGN,NODA,CHIBA 278,JAPAN
[5] SCI UNIV TOKYO,FAC ENGN,DEPT ELECT ENGN,SHINJUKU KU,TOKYO 162,JAPAN