1 Imperial School of Medicine at National Heart and Lung Institute, London SW3 6NP
2 Oxford Children’s Hospital, Oxford OX3 9DU
Correspondence to: A Bush, Department of Paediatric Respiratory Medicine, Royal Brompton Hospital, London SW3 6NP [email protected]
Contributors: AB wrote the first draft, thereafter both authors contributed equally to the manuscript as authors, and both act as guarantors.
Competing interests: None declared.
Provenance and peer review: Commissioned; externally peer reviewed.
doi:10.1136/bmj.39374.600081.AD
