Covered versus uncovered self- expandable nitinol stents in the palliative treatment of malignant distal biliary obstruction: results from a randomized, multicenter study by Kullman E., Frozanpor F., Söderlund C., Linder S., Sandström P., Lindhoff-Larsson A., Toth E., Lindell G., Jonas E., Freedman J., Ljungman M., Rudberg C., Ohlin B., Zacharias R., Leijonmarck C E., Teder K., Ringman A., Persson G., Gözen M., Eriksson O.

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