Response to the Letter to the Editor from Dai et al, Regarding "Smoking and the Risk of Pouchitis in Ulcerative Colitis Patients with Ileal Pouch Anal Anastomosis". Issue 4 (13th August 2018) - Gorrepati, Venkata Subhash; Stuart, August; Deiling, Susan; Koltun, Walter; Tinsley, Andrew; Williams, Emmanuelle D; Coates, Matthew D