It's an excellent question. I think it's a much more challenging one to identify people in the community who may have been exposed to the medication.
Perhaps pharmaceutical records might lead to people who have received mefloquine in the past. Again, I think we might be up against the challenge of how long records are kept. I know in my own field it's 10 years for keeping records. I'm not sure if that would apply. That's from my own college of psychologists, so I'm not sure how long pharmaceutical records would be held. I suspect a lot of the people who are exposed to mefloquine probably took it as long as 15 or 20 years ago.
It would be interesting to correlate the rates of psychiatric disability among those who have been so exposed perhaps through census or something like that, where you might ask such research questions. Did you ever take an anti-malarial drug? We could correlate that with the reactions, because it's not simply exposure. It's exposure plus that reaction. Then correlate that with subsequent psychological or psychiatric disability.