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To the Editor:
Drs. Beghi and Morrison wrote1 that limitations of our study on military service and risk of ALS2 are the retrospective approach, the lower mortality rates for veterans, and the selected population. We were puzzled by the characterization of the American Cancer Society study as “retrospective,” since all data on exposure (military service) and covariates (e.g., smoking) were obtained in 1982, seven years before the time interval 1989–1998 when the study identified deaths from ALS.
Thus, according to widely accepted definitions, …
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