Feng J He1, Puhong Zhang2, Yuan Li2, Graham A MacGregor3. 1. Wolfson Institute of Preventive Medicine, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London EC1M 6BQ, UK. Electronic address: f.he@qmul.ac.uk. 2. The George Institute for Global Health at Peking University Health Science Center, Haidian District, Beijing, China; Faculty of Medicine, University of New South Wales, Sydney, NSW, Australia. 3. Wolfson Institute of Preventive Medicine, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London EC1M 6BQ, UK.