4Lerner E Brooke, Garrison Herbert G, Nichol Graham, et al. An economic toolkit for identifying the cost of emergency medical services (EMS) systems : detailed methodology of the EMS Cost Analysis Project(EMSCAP)[J]. Academic Emergency Medicine, 2012,19 (2) : 210 - 216.
5Judith Tintinalli ,J Stapczynski ,O John Ma,et al. TintinaUi's Emergency Medicine: A Comprehensive Study Guide, Sev- enth Edition ( Book and DVD) [ D]. 2010.