[1] LINKOPING UNIV, DEPT INTERN MED, LINKOPING, SWEDEN
[2] REG HOSP OREBRO, DEPT INTERN MED, OREBRO, SWEDEN
[3] REG HOSP OREBRO, DEPT OBSTET & GYNAECOL, OREBRO, SWEDEN
[4] REG HOSP OREBRO, DEPT PAEDIAT, OREBRO, SWEDEN
[5] REG HOSP OREBRO, DEPT ENVIRONM HLTH, OREBRO, SWEDEN
[6] REG HOSP OREBRO, DEPT CLIN CHEM, OREBRO, SWEDEN
[7] REG HOSP OREBRO, SEROL LAB, OREBRO, SWEDEN