1 NHS England, Innovation Team, London, United Kingdom; King's College London, Guy's King's and St Thomas' School of Medicine, London, United Kingdom. Electronic address: faheem.ahmed@doctors.org.uk.
2 King's College London, Guy's King's and St Thomas' School of Medicine, London, United Kingdom.
3 St George's Hospital, Department of Radiology, London, United Kingdom.
4 Shriner's Burns Hospital for Children, Harvard Medical School, Boston, MA, USA.