| http://www.w3.org/ns/prov#value | - Their sexual health, sun exposure history, genetic factors such as eye and skin color, as well as their use of Viagra were noted, and over the course of 10 years, their incidences of skin cancers were tracked.It was found that men who used Viagra had about twice the risk of developing melanoma; the results showed there to be 142 incidences of melanoma, 580 of squamous cell carcinoma and 3,030 of b
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