TY - JOUR AU - Hellstrom, W J; Gittelman, M; Karlin, G TI - 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 JO - Urology IS - 04 VL - 61 PY - 2003 L3 - PubMed-ID: 12657355 SP - 8 EP - 14 N1 - , et al; Vardenafil Study Group. ER -