1. Department of Vascular Medicine, University Medical Center Utrecht, Utrecht University, the Netherlands (E.H.G., J.-P.A.C.V., F.L.J.V., W.S.).
2. Department of Internal Medicine, Ziekenhuis Gelderse Vallei, Ede, the Netherlands (R.H.H.B.).
3. Department of Internal Medicine, Rijnstate, Arnhem, the Netherlands (H.M.).
4. Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, the Netherlands (M.L.B.).