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Heimgartner, S; Eckardt, J; Simmen, D; Briner, H R; Leunig, A; Caversaccio, M D (2011). Limitations of balloon sinuplasty in frontal sinus surgery. European archives of oto-rhino-laryngology, 268(10), pp. 1463-7. Berlin: Springer-Verlag 10.1007/s00405-011-1626-7
