Ursodeoxycholic acid for the prevention of symptomatic gallstone disease after bariatric surgery (UPGRADE): a multicentre, double-blind, randomised, placebo-controlled superiority trial

Sylke Haal, Maimoena S S Guman, Thomas C C Boerlage, Yair I Z Acherman, L Maurits de Brauw, Sjoerd Bruin, Steve M M de Castro, Jeanin E van Hooft, Arnold W J M van de Laar, Daan E Moes, Manon Schouten, Ruben Schouten, Ellert J van Soest, Ruben N van Veen, Claire E E de Vries, Paul Fockens, Marcel G W Dijkgraaf, Victor E A Gerdes, Rogier P Voermans