Durmaz, Ozan, Adnan Ozkahraman, and Yusuf Kayar. “Rare Side Effect Due to Vedolizumab in a Patient With Ulcerative Colitis: Catatonic Depression”. Turkish Journal of Gastroenterology (October 9, 2025). Accessed January 1, 2026. https://turkjgastroenterol.org/index.php/tjg/article/view/4348.