Study of the Mechanisms of Biliary Stent Occlusion: an Analysis of Occluded and Nonoccluded Stents, with Emphasis on the Role of Antinucleating Biliary Anionic Peptide Factor - Prat, F; Cosson, C; Domingo, N; Chapat, O; Fompeydie, D; Nassar, N; Fritsch, J; Choury, A D; Pelletier, G; Buffet, C (Endoscopy, 2004)