Vitamin D levels vary during antiviral treatment but are unable to predict treatment outcome in HCV genotype 1 infected patients - Grammatikos, Georgios; Lange, Christian; Susser, Simone; Schwendy, Susanne; Dikopoulos, Nektarios; Buggisch, Peter; Encke, Jens; Teuber, Gerlinde; Goeser, Tobias; Thimme, Robert; Klinker, Hartwig; Böcher, Wulf Otto; et al. (PLOS ONE, 2014)