1. MRI (Magnetic Resonance Imaging) / MRCP (Magnetic Resonance Cholangiopancreatography) with gadolinium will be performed in all patients to assess the WON. In patients with contraindications to MRI, a CECT ( Contrast Enhanced, Computed Tomography) abdomen/pelvis will be obtained instead. In patients with contraindication to both MRI/MRCP and intravenous iodinated contrast (such as history of anaphylactic reaction to iodinated contrast agents or renal impairment with eGFR < 30 mL/min/1.73m2), a non-contrast enhanced CT will be performed. All imaging will be interpreted by the designated GI/abdominal radiologist at each participating center and also by an appointed multidisciplinary panel to determine suitability for inclusion in the study.