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Abstract
Mesh： See more » Emigration and Immigration/legislation & jurisprudenceEmigration and Immigration/statistics & numerical dataEmployment/legislation & jurisprudenceResearch Personnel/legislation & jurisprudenceSeptember 11 Terrorist AttacksStudents/legislation & jurisprudenceTime FactorsUnited StatesUnited States Government Agencies/legislation & jurisprudence
Year: 2009 PMID： 19727160 DOI： 10.1038/461012a
Source DB: PubMed Journal: Nature ISSN： 0028-0836 Impact factor: 49.962