Ursodeoxycholic acid for the prevention of symptomatic gallstone disease after bariatric surgery: study protocol for a randomized controlled trial (UPGRADE trial) by Thomas C. C. Boerlage, Sylke Haal, L. Maurits de Brauw, Yair I. Z. Acherman, Sjoerd Bruin, Arnold W. J. M. van de Laar, Daan E. Moes, Bart A. van Wagensveld, Claire E. E. de Vries, Ruben van Veen, Ruben Schouten, Marcel G. Dijkgraaf, Paul Fockens, Victor E. A. Gerdes, Rogier P. Voermans

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