| CD | Crohn’s disease; |
| CI | confidence interval; |
| DM | diabetes mellitus; |
| HR | hazard ratio; |
| IBD | inflammatory bowel disease; |
| IL | interleukin; |
| ICD-10 | International Classification of Diseases, tenth revision; |
| NHIS | National Health Insurance Service; |
| PD | Parkinson’s disease; |
| RID | rare intractable disease; |
| TNF | tumor necrosis factor; |
| UC | ulcerative colitis; |
| UK | United Kingdom. |
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