Thorax, the official journal of the British Thoracic Society, publishes influential clinical and experimental research in respiratory medicine, paediatrics, immunology, pharmacology, pathology, and surgery. The focus is on work that advances scientific understanding and impacts clinical practice. http://thorax.bmj.com/ * The purpose of this podcast is to educate and to inform. The content of this podcast does not constitute medical advice and it is not intended to function as a substitute for a healthcare practitioner’s judgement, patient care or treatment. The views expressed by contributors are those of the speakers. BMJ does not endorse any views or recommendations discussed or expressed on this podcast. Listeners should also be aware that professionals in the field may have different opinions. By listening to this podcast, listeners agree not to use its content as the basis for their own medical treatment or for the medical treatment of others.