1 School of Public Health, University of Queensland, Herston, Brisbane, QLD 4006, Australia. Electronic address: r.huxley@uq.edu.au.
2 The George Institute for Global Health, Nuffield Department of Population Health, University of Oxford, Oxford, UK.
3 School of Public Health, University of Queensland, Herston, Brisbane, QLD 4006, Australia.
4 The George Institute for Global Health, Nuffield Department of Population Health, University of Oxford, Oxford, UK; The George Institute for Global Health, University of Sydney, Sydney, NSW, Australia; Department of Epidemiology, Johns Hopkins University, Baltimore, MD, USA.