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International Statistical Classification of Diseases and Related Health Problems (ICD) codes of diseases analyzed in this study
| Disease | ICD |
| Ulcerative colitis, unspecified | K51.9 |
| Polyarthritis, unspecified | K51.9 |
| Rheumatoid arthritis, unspecified | M06.9 |
| Pyoderma gangrenosum | L88 |
| Atopic dermatitis | L20 |
| Primary sclerosing cholangitis | K83.0 |
| Ankylosing spondylitis | M45 |
