1 Vasculitis Clinic, Hammersmith Hospital, Imperial College Healthcare NHS Trust, London UK; Centre for Inflammatory Disease, Immunology & Inflammation, Imperial College London, London, UK.
2 Vasculitis Clinic, Hammersmith Hospital, Imperial College Healthcare NHS Trust, London UK.
3 Vasculitis Clinic, Hammersmith Hospital, Imperial College Healthcare NHS Trust, London UK; Centre for Inflammatory Disease, Immunology & Inflammation, Imperial College London, London, UK. Electronic address: s.mcadoo@imperial.ac.uk.