1. Division of Rheumatology, Department of Medicine, University of Michigan, Ann Arbor, MI, USA
2. Division of Pulmonary and Critical Care Medicine, David Geffen School of Medicine, University of California at Los Angeles, Los Angeles, CA, USA
3. Centre for Rheumatology, Division of Medicine, University College London, London, UK
4. Global Clinical Development, EMD Serono Inc., Billerica, MA, USA