1. Epidemiology & Biostatistics, University of Auckland , Private Bag 92019, Auckland 1142, New Zealand
2. Service Improvement and Innovation Directorate, Te Whatu Ora—Health New Zealand , Private Bag 93311, Auckland 1640, New Zealand
3. Adult Emergency Department, Auckland City Hospital , Private Bag 92024, Auckland 1142, New Zealand
4. Department of Surgery (Emergency Medicine), University of Auckland , Private Bag 92019, Auckland 1142, New Zealand
5. General Practice and Primary Health Care, University of Auckland , Private Bag 92019, Auckland 1142, New Zealand
6. Health Systems, University of Auckland , Private Bag 92019, Auckland 1142, New Zealand