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This was a retrospective study. While not the most accurate and well supported way to conduct a study, due to the effects of recall bias, it was really the only way to gain the data that was presented in the report. There isn't really anything new about the style of research. 

The policy definitely provides a good amount of suport for a large amount of people affected. However, certain populations are left out of this. The large number of transiet persons, as well as non-resident people, in New York City is enourmous. These people were surely affected by the attacks, but are not included in the policy. This is, of course, understandable, as tracking the presence of these people's is nearly impossible nearly 10 years after the attacks. Regardless, it is a flaw in the policy.