This came up in my news alert. It sounds pretty thin, but I'm passing it along anyway.
Am. J. Epidemiol. -- Abstracts: Weisskopf et al. 160 (1): 26
They have 11 years of data to work with, and 621 people in the set. I don't know enough statistics to know if that's good enough, but I know that the fact that ALS is so rare makes it harder to study.
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