DOI:
10.1055/s-00000165
Evidence-Based Spine-Care Journal
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References
Agency for Healthcare Research Quality (AHRQ).
Agency for Healthcare Research Quality (AHRQ).
HCUP Databases, Healthcare Cost and Utilization Project (HCUP): Overview of the Nationwide Inpatient Sample (NIS), 2013 . Available at:
http://www.hcup-us.ahrq.gov/nisoverview.jsp
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