1 Rheumatology and general internal medicine registrar, University College London Hospital, London, UK.
2 Consultant rheumatologist, Hammersmith Hospital, London, UK and honorary senior lecturer, National Heart and Lung Institute, London, UK.
3 Professor of rheumatology, UCL Centre for Rheumatology, London, UK and honorary consultant rheumatologist, University College London Hospital, London, UK.
4 Consultant rheumatologist, University College London Hospital, London, UK, associate professor, University College London, London, UK and co-chair, Hyperinflammation and HLH Across Speciality Collaboration, London, UK.
5 Consultant obstetric physician UCL EGA Institute for Women's Health, London, UK.