1. NHS Blood and Transplant; Haematology/Transfusion Medicine; Level 2, John Radcliffe Hospital Headington Oxford UK OX3 9BQ
2. University of Oxford; National Perinatal Epidemiology Unit (NPEU); Old Road Campus Oxford UK OX3 7LF
3. University of Oxford; Centre for Statistics in Medicine; Botnar Research Centre Windmill Road Oxford UK OX3 7LD
4. Ottawa Hospital Research Institute; Clinical Epidemiology Program; 501 Smyth Road Ottawa ON Canada K1H 8L6
5. University of Oxford; Oxford Clinical Trials Research Unit; Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences Windmill Road Oxford Oxfordshire UK OX3 7LD
6. Oxford University Hospitals NHS Foundation Trust and University of Oxford; NHS Blood and Transplant; National Institute for Health Research (NIHR) Oxford Biomedical Research Centre; John Radcliffe Hospital Headington Oxford UK