Ursodeoxycholic acid for the prevention of symptomatic gallstone disease after bariatric surgery: statistical analysis plan for a randomised controlled trial (UPGRADE trial) by Sylke Haal, Maimoena S. S. Guman, L. Maurits de Brauw, Ruben N. van Veen, Ruben Schouten, Paul Fockens, Victor E. A. Gerdes, Marcel G. W. Dijkgraaf, Rogier P. Voermans

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