We would like to thank I.A.R. Kuijlaars and S. van den Tillart, both students at Fontys University of Applied Sciences, Department of Physiotherapy for their support of video recording patients and helping out with video annotations. We also appreciate the assistance of H.C.W. van Dalen for patient recruitment and patient counselling. The support of personnel of our vascular laboratory is highly appreciated. The authors report no conflicts of interest in this work.