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. Author manuscript; available in PMC: 2013 Sep 30.
Published in final edited form as: AJR Am J Roentgenol. 2012 Oct;199(4):844–851. doi: 10.2214/AJR.11.8064
Number of visits Visit length
 a) None  a) 0-15 minutes
 b) One to three times  b) 15-30 minutes
 c) Three to five times  c) 30-45 minutes
 d) Greater then five times  d) Greater then 45 minutes