1. Department of Statistical Science; University College London; London UK
2. Veramed; ClinBay France
3. Infection Control and Environmental Health; Norwegian Institute of Public Health; Oslo Norway
4. UCL Institute for Child Health, Great Ormond Street Hospital for Children NHS Trust; Arthritis Research UK Centre for Adolescent Rheumatology at UCL and GOSH/ICH NIHR Biomedical Research Centre; London UK