- 1National Heart and Lung Institute, Imperial College, London, UK
- 2Paediatric Respiratory, Royal Brompton Hospital, London, UK
- Correspondence to Dr Andrew Bush, National Heart and Lung Institute, Imperial College, London, UK;
Contributors AB and CH contributed equally to the manuscript.
- Accepted 13 January 2012
- Published Online First 10 February 2012
We thank Dr Knowles and colleagues for their interest in our editorial.1 …