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Montorsi, F. Clinical safety of oral sildenafil citrate (VIAGRATM) in the treatment of erectile dysfunction—by Morales et al. Int J Impot Res 10, 73–74 (1998). https://doi.org/10.1038/sj.ijir.3900259
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DOI: https://doi.org/10.1038/sj.ijir.3900259