Assessing the protective role of allergic disease in gastrointestinal tract cancers using Mendelian randomization analysis. Issue 5 (21st October 2020) - Yuan, Shuai; Vithayathil, Mathew; Kar, Siddhartha; Carter, Paul; Mason, Amy M.; Xie, Shao‐Hua; Burgess, Stephen; Larsson, Susanna C.