“…All publications reported that men had ED for at least 6 months (where relevant), and most men had ED for at least 3 years (Tables and ). Disease duration was not reported as an eligibility criterion for 24 of the 40 publications [9,14,21,23,25–33,41,43,44,47–49,51–55]. The mean age of men with ED varied from 45 to 62 years [21,26], and most had ED of mixed or organic etiology [9,14,15,20–22,24–29,32–41,44,46–48,50–53,55,71].…”