Therapeutic Drug Monitoring of Vedolizumab in Inflammatory Bowel Disease Patients during Maintenance Treatment—TUMMY Study oleh Merve Sivridaş, Rob H. Creemers, Dennis R. Wong, Paul J. Boekema, Tessa E. H. Römkens, Lennard P. L. Gilissen, Adriaan A. van Bodegraven, Floris C. Loeff, Theo Rispens, Luc J. J. Derijks