1. Centre for Prognosis Research, School of Medicine Keele University Keele UK
2. Centre for Statistics in Medicine, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences University of Oxford Oxford UK
3. NIHR Oxford Biomedical Research Centre Oxford University Hospitals NHS Foundation Trust Oxford UK
4. Biostatistics Research Group, Department of Health Sciences, George Davies Centre University of Leicester Leicester UK
5. Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht University of Utrecht Utrecht The Netherlands
6. Department of Medical Epidemiology and Biostatistics Karolinska Institutet Stockholm Sweden