| http://www.w3.org/ns/prov#value | - , a rare genetic (runs in families) eye disease have stomach ulcers have a bleeding problem have a deformed penis shape or Peyronie???s disease have had an erection that lasted more than 4 hours take any medicines called ???alpha blockers??? (alpha blockers are sometimes prescribed for prostate problems or high blood pressure) have blood cell problems, such as sickle cell anemia, multiple myeloma,
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