Prabhat Jha1, Catherine Hill2, Daphne C N Wu3, Richard Peto4. 1. Centre for Global Health Research, Unity Health Toronto, University of Toronto, Toronto, ON M5B 1W8, Canada. Electronic address: prabhat.jha@utoronto.ca. 2. Institut Gustave Roussy, Villejuif, France. 3. Centre for Global Health Research, Unity Health Toronto, University of Toronto, Toronto, ON M5B 1W8, Canada. 4. Clinical Trial Service Unit, Richard Doll Building, University of Oxford, UK.