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ALS drug's approval draws cheers from patients, questions from skeptics

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A controversial new drug for ALS that just received FDA approval could add months to patients' lives, but some scientists question whether it actually works. (Manuel Balce Ceneta/AP)
A controversial new drug for ALS that just received FDA approval could add months to patients' lives, but some scientists question whether it actually works. (Manuel Balce Ceneta/AP)

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