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Watt, S., Primatesta, P. & Siegel, R. Response to Tomsak, R. PDE5 inhibitors and permanent visual loss (Int J Impot Res 2005; 17: 547–549). Int J Impot Res 18, 411 (2006). https://doi.org/10.1038/sj.ijir.3901451
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DOI: https://doi.org/10.1038/sj.ijir.3901451
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