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. Author manuscript; available in PMC: 2013 May 1.
Published in final edited form as: J Am Coll Surg. 2012 Feb 7;214(5):756–768. doi: 10.1016/j.jamcollsurg.2011.12.013

Figure 1.

Figure 1

Temporal distribution of published studies utilizing the NTDB (n=122).