| Is there ? amlodipine atorvastatin interaction The principle of supply and demand doesn't apply in the ER. The number of visits in the U.S. rose by a third from 1999 to 2009, while 158 hospital ERs, roughly 3 percent, closed between 1998 and 2008. Not surprisingly, wait times have grown by 25 percent; longer stretches spent waiting in the ER have been linked to higher rates of hospital admissions and deaths.
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