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病例对照研究可以直接计算RR。 （ ）
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第一篇Wayne Beno Wayne Beno was a true outdoorsman.Fishing,boating,hunting,walking through the woods with his three dogs,Wayne loved and did it all.Then life changed dramatically.Wayne was diagnosed with Parkinson’s disease(帕金森氏病). “For the next thirteen years I took 28 pills a day,had horrible side effects,and even with all those pills I still had lots of shaking and tremors(颤抖).I only went out during peak times,when I was looking and feeling my best.But that wasn’t often and I really couldn’t do much of anything.I felt like the life I loved was over,”said Wayne. Then Wayne’s doctor in Green Bay suggested he consider a breakthrough surgical option being offered at Froedtert & the Medical College of Wisconsin called Deep Brain Stimulation(刺激)(DBS).DBS is a surgical option used to treat disabling movement disorders related to Parkinson’s disease,essential tremor and more.It is not a cure,but significant improvement is seen in most movement disorder cases,with relatively low risk to the patient. In addition to his doctor’s recommendation,Wayne had a neighbor and fishing friend who had the DBS procedure at Froedtert & the Medical College of Wisconsin.His friend’s experience convinced Wayne that the 180-mile trip from his home in Crivitz,Wisconsin could be well worth the effort. And was it ever. “It was the best thing I ever did.I’m down to zero pills a day and I don’t shake at all,”reports Wayne.“Before the surgery,I felt bad every single day.Now I feel like my old self.I’m back to business as usual,which for me means fishing, fishing, and more fishing,every day of the year.Things just couldn’t be any better!” Deep Brain Stimulation is most effective for （）
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