Arterial wave intensity and ventricular-arterial coupling by vascular ultrasound: rationale and methods for the automated analysis of forwards and backwards running waves - Rakebrandt, F; Palombo, C; Swampillai, J; Schon, F; Donald, A; Kozakova, M; Kato, K; Fraser, A G (Ultrasound Med Biol, 2009)