1 Leeds Institute of Rheumatic and Musculoskeletal Medicine, University of Leeds, and NIHR Leeds Biomedical Research Centre, Leeds, United Kingdom. Electronic address: P.Conaghan@leeds.ac.uk.
2 Merck KGaA, Darmstadt, Germany.
3 EMD Serono Research and Development Institute, Inc., Billerica, MA, USA; an affiliate of Merck KGaA, Darmstadt, Germany.
4 NBCD A/S, Herlev, Denmark.
5 Chondrometrics GmbH, Ainring, Germany; Department of Imaging and Functional Musculoskeletal Research, Institute of Anatomy & Cell Biology, Paracelsus Medical University Salzburg & Nuremberg, Salzburg, Austria; Ludwig Boltzmann Institute for Arthritis and Rehabilitation, Paracelsus Medical University, Salzburg, Austria.
6 University of Maryland School of Medicine, Baltimore, MD, United States.