"Mesopotamia" is a descriptor in the National Library of Medicine's controlled vocabulary thesaurus,
MeSH (Medical Subject Headings). Descriptors are arranged in a hierarchical structure,
which enables searching at various levels of specificity.
Ancient land between the Tigris and Euphrates rivers, corresponding to modern-day Iraq and partly NE Syria, SE Turkey and smaller parts of SW Iran. It is considered to be the cradle of civilization in the West. Bronze Age Mesopotamia included Sumer and the Akkadian, Babylonian and Assyrian empires (from http://www.merriam-webster.com/dictionary/mesopotamia )
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