[1] AUSTRALIAN NATL UNIV,JOHN CURTIN SCH MED RES,DEPT MICROBIOL,CANBERRA 2601,ACT,AUSTRALIA
[2] AUSTIN HOSP,HEIDELBERG 3084,VICTORIA,AUSTRALIA
[3] HARVARD UNIV,DEPT RADIAT THERAPY,BOSTON,MA 02215
[4] NEW ENGLAND DEACONESS HOSP,SHIELDS WARREN RADIAT LAB,BOSTON,MA 02215