[1] INST MED STAT & BIOMATH, DUSSELDORF, GERMANY
[2] FREE UNIV BERLIN, KLINIKUM STEGLITZ, INST CLIN CHEM & CLIN BIOCHEM, D-1000 BERLIN 45, GERMANY
[3] FREE UNIV BERLIN, KLINIKUM STEGLITZ, PROJ STUDY GRP, D-1000 BERLIN 45, GERMANY
[4] BREMEN INST PREVENT RES & SOCIAL MED, BREMEN, GERMANY