ID4 and rheumatoid arthritis: Three of the newly‐identified regions in Table 2 were associated at P ≤ 5 × 10‐4 with other autoimmune diseases in the Open Targets Genetics portal: RLIMP2 (RA and hypothyroidism), SLC25A37 (hypothyroidism) and ID4 (ulcerative colitis), further supporting their association with T1D (Supporting Information S4: Table S6).