Assessment of differences between repeated pulse wave velocity measurements in terms of bias in the extrapolated cardiovascular risk and the classification of aortic stiffness: Is a single PWV measurement enough - Papaioannou, T.G.; Protogerou, A.D.; Nasothimiou, E.G.; Tzamouranis, D.; Skliros, N.; Achimastos, A.; Papadogiannis, D.; Stefanadis, C.I. (Journal of Human Hypertension, 2012)