| Keyword used in search string | No. of identified citations | Restricted to “adult” and “abstract” | Unique citations |
| Wegener granulomatosis | 560 | 332 | 332 |
| Microscopic polyangiitis | 152 | 106 | 63 |
| Churg–Strauss syndrome | 131 | 84 | 53 |
| Polyarteritis nodosa | 284 | 133 | 75 |
| Cryoglobulinemia | 304 | 201 | 197 |
| Antibodies, antineutrophil cytoplasmic AND vasculitis | 420 | 247 | 89 |
| Total no of identified citations | 809 |