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pmid:12837435, doi:10.1016/s0090-4295(03)00359-5, clinical trial, multicenter study, randomized controlled trial, research support, non-u.s. gov't, hartmut porst, harin padma-nathan, raymond rosen, 3',5'-cyclic-gmp phosphodiesterases, adult, aged, aged, 80 and over, carbolines / administration & dosage, carbolines / pharmacokinetics, carbolines / therapeutic use*, cyclic nucleotide phosphodiesterases, type 5, double-blind method, erectile dysfunction / drug therapy*, half-life, humans, male, middle aged, patient satisfaction, phosphodiesterase inhibitors / administration & dosage, phosphodiesterase inhibitors / pharmacokinetics, phosphodiesterase inhibitors / therapeutic use*, phosphoric diester hydrolases / drug effects, tadalafil, time factors, treatment outcome, pubmed abstract, nih, nlm, ncbi, national institutes of health, national center for biotechnology information, national library of medicine, medline
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