*Istituto di Medicina Interna, Malattie Infettive & Immunopatologia, University of Milan, Milan, Italy
*Department of Rheumatology, St Bartholomew's Hospital, London, UK
†Lupus Research Unit, The Rayne Institute, St Thomas' Hospital, London, UK
‡Laboratoire d'Immunologie, Centre Hospitalier Regional et Universitaire, Brest, France
✉Correspondence to: Graham R. V. Hughes MD, FRCD, Consultant Rheumatologist, The Rayne Institute, St Thomas' Hospital, London SE1 7EH, UK.