1 Division of Medical Biology, Department of Pathology and Medical Biology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands; Research & Development, IQ Products BV., Groningen, the Netherlands.
2 Research & Development, IQ Products BV., Groningen, the Netherlands; Dept. Analytical Biochemistry, University of Groningen, Groningen, the Netherlands.
3 Dept. Analytical Biochemistry, University of Groningen, Groningen, the Netherlands.
4 Dept. of Obstetrics and Gynecology, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands.
5 OLVG, Dept. of Obstetrics and Gynecology, Amsterdam, the Netherlands.
6 Division of Medical Biology, Department of Pathology and Medical Biology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands.