1 There are three versions of the oral glucose tolerance test: the 1-hour test, the 2-hour test, and the 3-hour test.  In the eight hours leading up to the test, you should not eat food or drink any beverages aside from water.
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However, a Meta search engine is such a search engine that collects data from other regular search engines, consolidate the gathered results and show them to the user. That means, there is a high probability to get more and refined result from a Meta Search Engine. The Architecture of Meta Search Engines