Government of the People's Republic of China - China-Japan Friendship Hospital, China Health Education Center, World Health Organization (WHO) - Collaborating Center for Tobacco Cessation and Respiratory Diseases Prevention, Government of the People's Republic of China - Center of Respiratory Medicine, World Health Organization (WHO) - Collaborating Center for Tobacco Cessation and Respiratory Diseases Prevention, World Health Organization (WHO) - Collaborating Center for Tobacco Cessation and Respiratory Diseases Prevention, World Health Organization (WHO) - Collaborating Center for Tobacco Cessation and Respiratory Diseases Prevention, World Health Organization (WHO) - Collaborating Center for Tobacco Cessation and Respiratory Diseases Prevention, Government of the People's Republic of China - Center of Respiratory Medicine, World Health Organization (WHO) - Collaborating Center for Tobacco Cessation and Respiratory Diseases Prevention, World Health Organization (WHO) - Collaborating Center for Tobacco Cessation and Respiratory Diseases Prevention, Queen Mary University of London, Queen Mary University of London, Imperial College London - National Heart and Lung Institute, University of Oxford - Clinical Trial Service Unit and Epidemiological Studies Unit, Queen Mary University of London, Government of the People's Republic of China - Center of Respiratory Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC) - State Key Laboratory of Medical Molecular Biology and Independent

London South Bank University, London South Bank University, Queen Mary University of London, University of Stirling - Institute for Social Marketing and Health, University of East Anglia (UEA), Cardiff University, University of East Anglia (UEA), University of Stirling, SPECTRUM Consortium, University of East Anglia (UEA), London South Bank University, Cardiff University, London South Bank University, Cardiff University, Queen Mary University of London, London South Bank University, University of York, University of York - Department of Health Sciences, University of Edinburgh - Usher Institute and SPECTRUM Consortium, London South Bank University and University College London - Department of Behavioural Science and Health