[1] SATAKUNTA CENT HOSP,DEPT MED,PORI,FINLAND
[2] UNIV TURKU,DEPT PATHOL,SF-20500 TURKU 50,FINLAND
[3] UNIV TURKU,DEPT MED MICROBIOL,SF-20500 TURKU 50,FINLAND
[4] UNIV HELSINKI,DEPT MED GENET,SF-00170 HELSINKI 17,FINLAND
[5] FOLKHALSAN INST GENET,HELSINKI,FINLAND