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Evaluation of vardenafil for the treatment of subjective tinnitus: a controlled pilot study

Birgit Mazurek*, Heidemarie Haupt, Agnieszka J Szczepek, Jörg Sandmann, Johann Gross, Burghard F Klapp, Holger Kiesewetter, Ulrich Kalus, Timo Stöver and Philipp P Caffier

Journal of Negative Results in BioMedicine 2009, 8:3 doi:10.1186/1477-5751-8-3

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