A Clinical Trial to Compare Etrolizumab with Placebo and Adalimumab in Patients with Moderate to Severe Ulcerative Colitis Who Have not Received Treatment with Tumour Necrosis Factor Inhibitors (Hibiscus I)

A Study Comparing the Efficacy and Safety of Etrolizumab With Adalimumab and Placebo in Participants With Moderate to Severe Ulcerative Colitis (UC) in Participants Naive to Tumor Necrosis Factor (TNF) Inhibitors