Expert consensus document on arterial stiffness: Methodological issues and clinical applications - Laurent, S; Cockcroft, J; Van Bortel, L; Boutouyrie, P; Giannattasio, C; Hayoz, D; Pannier, B; Vlachopoulos, C; Wilkinson, I; Struijker-Boudier, H; European Network for Non-invasive Investigation of Large Arteries (Eur Heart J, 2006)