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STUDY SELECTION AND DATA EXTRACTION: All identified research, review articles, and abstracts were assessed for relevance, and all relevant information was included. Priority was given to the primary medical literature and clinical trial reports. The Massachusetts Male Aging Study surveyed 1709 men aged 40–70 years in the greater Boston area between 1987 and 1989 and reported a prevalence of erectile dysfunction of 52%, with 9.6% of respondents reporting complete erectile dysfunction.5 In 2000 the overall prevalence of erectile dysfunction in this study population was re-estimated to be 44%.6 The Massachusetts study is important because it is the first cross-sectional, community-based, random-sample multidisciplinary survey on the topic and involved a significant cohort followed up for nearly a decade beyond the initial assessment. A survey of 3009 men aged 18–70 years from all regions of Canada revealed a similar prevalence of erectile dysfunction.7 After your physical examination and interview, your doctor may then order any one of the following tests: best place to buy viagra online where to buy viagra without prescription All you need to know when buying Viagra Online canadian pharmacy viagra Marc S. Rendell, MD; Jacob Rajfer, MD; Pierre A. Wicker, MD; Michael D. Smith, PhD; for the Sildenafil Diabetes Study Group None of the volunteers reported any pain or side-effects from the treatment.