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Specifically this section I suppose:

> The symptoms experienced by the victims — headaches, hearing loss, cognitive problems, loss of balance, etc. — are frequently found in the general population, these scientists argued, and can be attributed to many causes.

also page 35 mentions that there's genetic factors (PON1 gene) that affect organophosphate susceptibilities
Possibly CYP2D6 polymorphism has a role too https://www.ncbi.nlm.nih.gov/pubmed/26723569