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Correspondence to Dr Sol Richardson, Vanke School of Public Health, Tsinghua University, Haidian District, Beijing 100083, China; srichardson{at}mail.tsinghua.edu.cn Objectives To describe the ...

1 Department of Respiratory Medicine, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, UK 2 NIHR Cardiovascular Biomedical Research Unit, William Harvey ...