What is the number of neurosurgeons per 100000 people in the U.S.?

The data indicated that the ratio of neurosurgeons to total US population is 1:65,580. ( 1 ) 

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1. Is there a shortage of neurosurgeons in the United States?
   Neurosurgery. 2013 Aug;73(2):354-5; discussion 365-6 
   http://www.ncbi.nlm.nih.gov/pubmed/23660716
   
2. Everything You Thought You Knew About the Physician … – AAMC
   
3. Geographical Neurosurgery Workforce Analysis from 1990 to 2005 …