Rubio-Aurioles E, Kim ED, Rosen RC, Porst H, Burns P, Zeigler H, Wong DG. ORIGINAL RESEARCH–COUPLES' SEXUAL DYSFUNCTIONS: Impact on Erectile Function and Sexual Quality of Life of Couples: A Double-Blind, Randomized, Placebo-Controlled Trial of Tadalafil Taken Once Daily. The Journal of Sexual Medicine. 2009 May;6(5):1314–23. doi: 10.1111/j.1743-6109.2009.01222.x.
ORIGINAL RESEARCH–COUPLES' SEXUAL DYSFUNCTIONS: Impact on Erectile Function and Sexual Quality of Life of Couples: A Double-Blind, Randomized, Placebo-Controlled Trial of Tadalafil Taken Once Daily