1. Departments of Laboratory Medicine (W.H.A.d.J., F.A.J.M., I.P.K.), University Medical Center, University of Groningen, 9700 RB Groningen, The Netherlands
2. Institute of Clinical Chemistry and Laboratory Medicine and Department of Medicine (G.E.), University of Dresden, 01187 Dresden, Germany
3. Epidemiology (W.J.P.), University Medical Center, University of Groningen, 9700 RB Groningen, The Netherlands
4. Medical Oncology (E.G.E.d.V.), University Medical Center, University of Groningen, 9700 RB Groningen, The Netherlands