[1] UNIV BERGEN,DEPT ORAL PATHOL & FORENS ODONTOL,N-5014 BERGEN,NORWAY
[2] UNIV OSLO,FORENS ODONTOL SECT,OSLO 3,NORWAY
[3] NORWEGIAN RADIUM HOSP,DEPT PATHOL,OSLO 3,NORWAY
[4] REG HOSP TRONDHEIM,DEPT PATHOL,TRONDHEIM,NORWAY
[5] ROYAL DENT COLL,DEPT ORAL DIAG,DK-2100 COPENHAGEN O,DENMARK