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Bergmann-Hug, K; Wirth, R; Henseler, M; Helbling, A; Pichler, W J; Schnyder, B (2009). Effect of natural seasonal pollen exposure and repeated nasal allergen provocations on elevation of exhaled nitric oxide. Allergy, 64(11), pp. 1629-34. Oxford: Wiley-Blackwell 10.1111/j.1398-9995.2009.02087.x
