http://orcid.org/0000-0001-5768-6777Lionel Dufour1, Ashly Simon2, http://orcid.org/0000-0002-4480-1147Matthew J Murray2,3, Sam Behjati2,4 1 Department of Paediatrics, Barking Havering and Redbridge Hospitals NHS Trust, Romford, UK 2 Cambridge University Hospital NHS Foundation Trust, Cambridge, UK 3 Department of Pathology, University of Cambridge, Cambridge, UK 4 Wellcome Sanger Institute, Hinxton, Cambridgeshire, UK Correspondence to Dr Sam Behjati, Department of Paediatrics, Cambridge...