[1] NORWEGIAN RADIUM HOSP, DEPT PATHOL, OSLO, NORWAY
[2] NORSK HYDROS INST CANC RES, OSLO, NORWAY
[3] RUSH PRESBYTERIAN ST LUKES MED CTR, CHICAGO, IL 60612 USA
[4] COLUMBIA UNIV COLL PHYS & SURG, DEPT PATHOL, NEW YORK, NY 10032 USA
[5] INST CANC RES, DEPT PATHOL, OSLO, NORWAY
[6] UNIV PORTO, FAC MED, PORTO, PORTUGAL