1 Jobst Vascular Institute, Toledo Hospital, Toledo, OH, USA.
2 Department of Hematology, Oslo University Hospital, Oslo, Norway.
3 Center for Thrombosis and Hemostasis (CTH), University Medical Center Mainz, Mainz, Germany.
4 Department of Radiology, Maastricht University Medical Centre, Maastricht, The Netherlands.
5 Department of Surgery, Section of Vascular Surgery, Conrad Jobst Vascular Research Laboratories, Ann Arbor, MI, USA.
6 Department of Radiology and Interventional Radiology, VieCuri Medical Centre, Venlo, The Netherlands.
7 Department of Venous Surgery, Maastricht University Medical Centre, Maastricht, The Netherlands.
8 Department of Venous Surgery, Maastricht University Medical Centre, Maastricht, The Netherlands; Department of Vascular Surgery, University Hospital Aachen, Aachen, Germany.
9 Department of Venous Surgery, Maastricht University Medical Centre, Maastricht, The Netherlands; Department of Vascular Surgery, University Hospital Aachen, Aachen, Germany. Electronic address: c.wittens@me.com.