Clinicopathological and prognostic significance of serum and tissue Dickkopf-1 levels in human hepatocellular carcinoma. - Tung EK; Mak CK; Fatima S; Lo RC; Zhao H; Zhang C; Dai H; Poon RT; Yuen MF; Lai CL; Li JJ; Luk JM; et al. (Liver international : official journal of the International Association for the Study of the Liver, 2011)