Department of Preventive and Social Medicine, Dunedin School of Medicine, University of Otago, Dunedin, New Zealand. Center for Biostatistics, Division of Health Sciences, University of Otago, Dunedin, New Zealand. Department of Medicine, Division of Preventive Medicine, Brigham and Women's Hospital, Boston, MA, USA. The George Institute for Global Health, University of Oxford, Oxford, UK. The George Institute for Global Health, RPA Hospital, University of New South Wales, Camperdown, NSW, Australia. Department of Epidemiology, Johns Hopkins University, Baltimore, MD, USA. Libin Cardiovascular Institute of Alberta, University of Calgary, Calgary, AB, Canada.