[1] UNIV HELSINKI,DEPT PULM DIS,SF-00170 HELSINKI 17,FINLAND
[2] UNIV HELSINKI,DEPT RADIOTHERAPY & ONCOL,SF-00170 HELSINKI 17,FINLAND
[3] UNIV HELSINKI,DEPT NEUROL,SF-00170 HELSINKI 17,FINLAND
[4] UNIV HELSINKI,DEPT NEUROPHYSIOL,SF-00170 HELSINKI 17,FINLAND
[5] UNIV HELSINKI,DEPT DIAGNOST RADIOL ORL,SF-00170 HELSINKI 17,FINLAND
[6] UNIV HELSINKI,OBSTET & GYNECOL 1 LAB,SF-00170 HELSINKI 17,FINLAND