1. Department of Blood and Marrow Transplant; Royal Manchester Children's Hospital; Manchester UK
2. Clinical Virology Department; Manchester Royal Infirmary; Manchester UK
3. Department of Neurology; Royal Manchester Children's Hospital; Manchester UK
4. Diagnostic Paediatric Histopathology Service; Royal Manchester Children's Hospital; Manchester UK
5. Microbiology, Virology and Infection Prevention and Control; Great Ormond Street Hospital for Children; London UK
6. Research Department of Infection; Division of Infection and Immunity; University College of London; London UK