| http://www.w3.org/ns/prov#value | - Created and operated by the Agency for Healthcare Research and Quality, the NIS is the largest all-payer inpatient database in the United States and consists of a 20% stratified sample of inpatient discharges from more than 1050 hospitals in 44 states as of 2009.19 Thus, it covers 95% of the US population.
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