Symmetrical and asymmetrical dimethylarginine as predictors for mortality in patients referred for coronary angiography: the Ludwigshafen Risk and Cardiovascular Health study - Meinitzer, A; Kielstein, J T; Pilz, S; Drechsler, C; Ritz, E; Boehm, B O; Winkelmann, B R; März, W (Clin Chem, 2011)