Acknowledgement
We analyzed the NIS database from 2007 to 2017, available online at http://www.hcupus.ahrq.gov. The NIS is a large publicly available all-payer inpatient care database in the US that contains data on more than seven million hospital stays annually. Its large sample size is ideal for developing national and regional estimates, and enables analyses of rare conditions, uncommon treatments, and special populations.
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