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1996
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Pfizer (United Kingdom)(Current)
Ballard Sa is an author at Pfizer (United Kingdom).
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1996–1996
Sildenafil: an orally active type 5 cyclic GMP-specific phosphodiesterase inhibitor for the treatment of penile erectile dysfunction.
Mitra Boolell, Allen Mj, Ballard Sa et al. · PubMed · 1996 · 1.1K citations
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