Department of Emergency Medicine,Faculty of Medicine,Chiang Mai University,Chiang Mai 50200,Thailand
Department of Family Medicine,Faculty of Medicine,Chiang Mai University,Chiang Mai 50200,Thailand
Center for Clinical Epidemiology and Clinical Statistics,Faculty of Medicine,Chiang Mai University,Chiang Mai 50200,Thailand
Department of Emergency Medicine,University of California Davis School of Medicine,Sacramento 95817,USA
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