1. From Ambulance Victoria, Melbourne, Victoria, Australia (K.S., E.A., M.L., Z.N., S.B.); Department of Epidemiology and Preventive Medicine, Monash University, Melbourne, Victoria, Australia (K.S., E.A., M.L., Z.N., S.B.); School of Primary, Aboriginal, and Rural Health Care, University of Western Australia, Perth, Western Australia, Australia (K.S.); and Alfred Hospital, Melbourne, Victoria, Australia (S.B.).