FUT2 and type 1 diabetes mellitus: Ahypothesis-free look-up in MR-base of all available traits and outcomes identifiedassociations of rs492602:A > G FUT2 genotype with Crohn’s disease,cholesterol levels, inflammatory bowel disease and type 1 diabetes, but no associations forrs1047781:A > T FUT2 genotype, the SNP on which our findings are based.A future study could combine multiple genetic variants to proxy for vitamin B12in order to overcome pleiotropy.