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Gex-Collet, C; Imhof, L; Brattström, A; Pichler, W J; Helbling, A (2006). The butterbur extract petasin has no effect on skin test reactivity induced by different stimuli: a randomized, double-blind crossover study using histamine, codeine, methacholine, and aeroallergen solutions. Journal of investigational allergology & clinical immunology, 16(3), pp. 156-61. Barcelona: Esmon Publicidad
