[1] UNIV BRITISH COLUMBIA,DEPT RADIOL,VANCOUVER,BC,CANADA
[2] VANCOUVER HOSP & HLTH SCI CTR,VANCOUVER,BC,CANADA
[3] UNIV CALIF SAN DIEGO,SCH MED,DEPT RADIOL,SAN DIEGO,CA 92103
[4] ROYAL BROMPTON NATL HEART & LUNG HOSP,DEPT RADIOL,LONDON SW3 6NP,ENGLAND
[5] NYU,MED CTR,DEPT RADIOL,NEW YORK,NY
[6] HOP CALMETTE,DEPT RADIOL,LILLE,FRANCE
[7] UNIV CALIF SAN FRANCISCO,SCH MED,DEPT RADIOL,SAN FRANCISCO,CA 94143
[8] JOHNS HOPKINS UNIV,SCH MED,DEPT RADIOL,BALTIMORE,MD 21205