DOI:
10.1055/s-00000012
Endoscopy
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References
Agency for Healthcare Research and Quality.
Introduction to the HCUP nationwide inpatient sample (NIS).
Rockville, MD: Available at (Accessed Apr 03 2020):
https://www.hcup-us.ahrq.gov/db/nation/nis/NIS_Introduction_2016.jsp
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