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1 Richard Peto is a professor in the Nuffield Department of Population Health CTSU, University of Oxford, Oxford, UK. rpeto@ctsu.ox.ac.uk.
2 Alan D. Lopez is a professor at the Melbourne School of Population and Global Health, University of Melbourne, Victoria, Australia. alan.lopez@unimelb.edu.au.
3 Ole F. Norheim is a professor in the Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway. ole.norheim@igs.uib.no.
1 Richard Peto is a professor in the Nuffield Department of Population Health CTSU, University of Oxford, Oxford, UK. rpeto@ctsu.ox.ac.uk.
2 Alan D. Lopez is a professor at the Melbourne School of Population and Global Health, University of Melbourne, Victoria, Australia. alan.lopez@unimelb.edu.au.
3 Ole F. Norheim is a professor in the Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway. ole.norheim@igs.uib.no.