Erectile dysfunction has been defined by the NIH Consensus Development Panel on Impotence as "the inability to attain and/or maintain penile erection sufficient for satisfactory sexual performance" (NIH Consensus Development Panel on Impotence 1993). Today, it is generally accepted that the pathogenesis of erectile dysfunction is multifactorial, and several emotional, physical and medical factors contribute to the degree of the dysfunction. The prevalence of erectile dysfunction increases with age, and results of various surveys indicate an overall prevalence in males aged between 30 and 80 years of approximately 20% (Shabsigh and Anastasiadis 2003; Braun etal. 2003).
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