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The study design. DRAQ, IIEF, PITPQ, PRN (as needed), SEP, and V. *Wash-out period was 7–10 days, up to 10 days have been included in the timeline (i.e., 1.5 weeks). The number of weeks had been rounded up to the nearest integer. DRAQ: Drug Attributes Questionnaire; IIEF: International Index of Erectile Function; PITPQ: Phosphodiesterase 5 Inhibitor Treatment Preference Questionnaire; PRN: pro re nata; SEP: sexual encounter profile; V: visit.
