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| Search No. | Search Strategy | Results |
| 1 | "chronic idiopathic urticaria".mp. | 810 |
| 2 | ("chronic idiopathic urticaria" or "chronic idiopathic/spontaneous urticaria" or "ciu/csu" or "csu/ciu" or "spontaneous chronic urticaria" or "idiopathic chronic urticaria").mp. | 904 |
| 3 | 1 or 2 | 904 |
| 4 | Diet/ | 199,421 |
| 5 | ("diet" or "diet influence" or "diet regimen" or "dietary effect" or diet*).mp. | 964,556 |
| 6 | 4 or 5 | 964,556 |
| 7 | 3 and 6 | 14 |
