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BackgroundWe investigated the potential for selection bias due to non‐participation in the follow‐up of a large prospective cohort study.
MethodsLicensed pesticide applicators (52,395 private; 4,916 commercial) in the Agricultural Health Study provided demographic, health, and pesticide exposure information at enrollment (1993–1997) and in a 5‐year follow‐up telephone interview. Factors associated...
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