Hellstrom WJ, Gittelman M, Karlin G. , et al; Vardenafil Study Group.
Sustained efficacy and tolerability of vardenafil, a highly potent selective phosphodiesterase type 5 inhibitor, in men with erectile dysfunction: results of a randomized, double-blind, 26-week placebo-controlled pivotal trial.
61 (04) (Suppl. 01) 8-14
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