1. Bristol Haematology Oncology Centre, Bristol, United Kingdom.
2. Division of Epidemiology and Biostatistics, Leeds Institute of Cardiovascular and Metabolic Medicine, School of Medicine, University of Leeds, Leeds, United Kingdom.
3. Cancer Epidemiology Group, Section of Epidemiology and Biostatistics, Institute of Cancer and Pathology, St James's University Hospital, University of Leeds, Leeds, United Kingdom.
4. Teenage Cancer Trust, London, United Kingdom.
5. University College London, NHS Foundation Trust, London, United Kingdom.