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Röösli, C; von Büren, T; Gassmann, N B; Huber, A M (2011). The impact of platelet-derived growth factor on closure of chronic tympanic membrane perforations: a randomized, double-blind, placebo-controlled study. Otology & neurotology : official publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology, 32(8):1224-9.