Cite
MLA Citation
Jorrit L Opstelten et al.. “Prediagnostic Serum Vitamin D Levels and the Risk of Crohn's Disease and Ulcerative Colitis in European Populations: A Nested Case-Control Study.” Inflammatory bowel diseases, vol. 24, no. 3, 2018, pp. 633–640. http://access.bl.uk/ark:/81055/vdc_100095322022.0x00002c