[1] HUDDINGE HOSP,DEPT SURG,STOCKHOLM,SWEDEN
[2] KAROLINSKA HOSP,DEPT BACTERIOL,S-10401 STOCKHOLM,SWEDEN
[3] DANDERYD HOSP,SWEDISH INST INFECT DIS CONTROL,DEPT BACTERIOL,STOCKHOLM,SWEDEN
[4] HUDDINGE HOSP,DIV NEUROL,STOCKHOLM,SWEDEN
[5] KAROLINSKA HOSP,DEPT PATHOL,S-10401 STOCKHOLM,SWEDEN
[6] ST GORANS UNIV HOSP,DEPT PEDIAT,KAROLINSKA HOSP,KAROLINSKA INST,STOCKHOLM,SWEDEN