Pretreatment Vitamin D Concentrations Do Not Predict Therapeutic Outcome to Anti-TNF Therapies in Biologic-Naïve Patients With Active Luminal Crohn's Disease. - Chanchlani N; Lin S; Smith R; Roberts C; Nice R; McDonald TJ; Hamilton B; Bishara M; Bewshea C; Kennedy NA; Goodhand JR; Ahmad T (Crohn's & colitis 360, 2023)