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(A) Plot of the number of patients with trauma every month. (B) The number of IVRs per 100 patients with trauma every month. The pre-protocol implementation period was from 2004 Q1 to 2011 Q4; the protocol development period (phase-in period) was from 2012 Q1 to 2012 Q4, showing red shadow; the post-protocol implementation period was from 2013 Q1 to 2019 Q4. Q1: January to March, Q2: April to June, Q3: July to September, Q4: October to December; IVR: Interventional radiology.
