1 Bedfordshire - Milton Keynes Vascular Centre, Bedfordshire Hospitals NHS Foundation Trust, Bedford, UK.
2 St George's Vascular Institute, St George's Hospital, London, UK.
3 Department of Biomedical and Preclinical Sciences, University of Liège, Liège, Belgium; and GIGA Cardiovascular Sciences, University of Liège, Liège, Belgium. Electronic address: Philippe.Kolh@chuliege.be.