CJCP     2023 25 (8):  870-876    ISSN: 1008-8830  CN: 43-1301/R Mechanism of action and exogenous supplementation of vitamin D in Crohn's disease XIA Yu, ZHOU Juan, ZHAO Hong-Mei, YOU Jie-Yu Department of Gastroenterology and Nutrition, Hunan Children's Hospital, Changsha 410007, China Received: 2022-12-14  Revised: null  Online: null Supporting info null