1 Department of Laboratory Medicine, Department of Haematology, University of Groningen, University Medical Centre Groningen, the Netherlands. Electronic address: r.mulder01@umcg.nl.
2 Division of Haemostasis and Thrombosis, Department of Haematology, University of Groningen, University Medical Centre Groningen, the Netherlands.
3 Department of Laboratory Medicine, Department of Haematology, University of Groningen, University Medical Centre Groningen, the Netherlands.