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Data source: The 2014 HRSA Area Resource File was used to identify US counties. The 2012 CMS National Provider Identifier was used to identify CRNAs and the 2012 AMA Physician Master File was used to identify anesthesiologists.
*Note: CRNA addresses represent CMS billing addresses. Anesthesiologist addresses are self-reported professional mailing addresses in the AMA Physician Master File.