Aylwin, C.J., König, T.C., Brennan, N.W. et al. (2017). Reduction in Critical Mortality in Urban Mass Casualty Incidents: Analysis of Triage, Surge, and Resource Use After the London Bombings on July 7, 2005. (Abstract only.) Lancet. 368(9554):2219-25.
The authors retrospectively analyzed the pre-hospital and hospital response to the 2005 London bombings. They found that over-triage rates were reduced where advanced prehospital teams did initial scene triage, and that critical mortality did not seem to be related to over-triage.