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The other half were exposed to 2.7 Gy in 26 sessions spread over just five weeks. "The problem with the study is the very rough assessment for restless legs syndrome," Pollm?cher told Reuters Health, meaning that other conditions could be confused with restless legs. Pollm?cher has studied the syndrome in pregnant women. An erection occurs as a hydraulic effect due to blood entering and being retained in sponge-like bodies within the penis. The process is most often initiated as a result of sexual arousal, when signals are transmitted from the brain to nerves in the pelvis. Erectile dysfunction is indicated when an erection is consistently difficult or impossible to produce, despite arousal. There are various and often multiple underlying causes, some of which are treatable medical conditions. The most important organic causes are cardiovascular disease and diabetes, neurological problems (for example, trauma from prostatectomy surgery), hormonal insufficiencies (hypogonadism) and drug side effects. It is important to realize that erectile dysfunction can signal underlying risk for cardiovascular disease. An erection starts in the brain, where arousal signals trigger a chemical chain reaction. This process results in relaxation of the muscle in the blood vessel walls that keeps blood from flowing into the penis. Lots of different things can go wrong along the way, which is why there are so many different causes of ED. generic viagra here canadian pharmacy viagra for sale online online viagra without prescription canadian pharmacy viagra for sale online Patient controls state of erection