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Trial design. ACC, allergen challenge chamber; AIT, allergen immunotherapy; TU, therapeutic units. Subcutaneous injections (upper arm) were administered first at dose escalation steps of 7 d (100, 200, 400, 800, 1500, 3000, and 6000 TU); the maintenance dose of 6000 TU was then administered after 2 wk, and then after 4 wk and finally extended to intervals of 6‐8 wk
