The study authors then said that what you must also implicitly do is two things: look at a more serious accident, and look at a site that has a higher density of population around it. I'm assuming that one of the reasons they did that.... The government instructed the authors to look at the sites they looked at. I don't remember anywhere in the study where the authors said that they chose the sites. The government said to pick these two sites.
On November 30th, 2009. See this statement in context.