Introduction

Affiliations

• ¹ Leeds Institute of Rheumatic and Musculoskeletal Medicine, University of Leeds, and NIHR Leeds Musculoskeletal Biomedical Research Unit, Leeds, UK; p.conaghan@leeds.ac.uk.
• ² Sorbonne Universités, UPMC Univ Paris 06, GRC-08, Institut Pierre Louis d'Epidémiologie et de Santé Publique; Rheumatology Department, Pitie-Salpétrière Hospital, AP-HP, Paris, France.
• ³ APHP, Rheumatology Department, Hôpital Ambroise Paré, Boulogne-Billancourt; INSERM U1173, Laboratoire d'Excellence INFLAMEX, UFR Simone Veil, Versailles-Saint-Quentin University, Saint-Quentin en Yvelines; France.