1. Department of General Practice and Primary Healthcare, University of Auckland, Auckland, New Zealand
2. Department of Psychological Medicine, University of Auckland, Auckland, New Zealand
3. Department of General Practice, The University of Melbourne, Melbourne, Australia
4. Interior Health Authority, Kelowna, British Columbia, Canada
5. Fred Hutchinson Center, Seattle, WA, USA
6. Department of Epidemiology and Biostatistics, Faculty of Medical and Health Sciences, School of Population Health, University of Auckland, Auckland, New Zealand