<qa>  What is the name of the study that randomized the study?11. De Palma GD, Galloro G, Sicilliano S, Ivonini P, Catanzano C. Unilateral versus bilateral endoscopic hepatic duct drainage in patients with malignant hilar biliary obstruction: results of a prospective, randomized and controlled study. Gastrointest Endosc 2001;53:547-53 