- Mucosal healing will be assessed by VCE (data will be quantitated using the Lewis score). Patients requiring colonoscopy according to Physicians decision would also be offered to participate in an endoscopic mucosal healing evaluation substudy. Patients participating will undergo colonoscopy and biopsies at the beginning (screening±1 week) and the end (week 12±1 week) of the treatment period. Endoscopic damage will be assessed using the CDEIS