Hopkinson Nicholas S, Agrawal Sanjay, Sherrington Rebecca, Carter Peter, Atherton Janet, Doull Iolo, Cass Hilary
British Thoracic Society Chronic Obstructive Pulmonary Disease Specialist Advisory Group, Royal Brompton Hospital, Imperial College, London SW3 6NP, UK
British Thoracic Specialist Advisory Group on Tobacco, Leicester, UK.
BMJ. 2014 Dec 29;349:g7751. doi: 10.1136/bmj.g7751.