Genetic Factors for the Severity of ACPA-negative Rheumatoid Arthritis in 2 Cohorts of Early Disease: A Genome-wide...

Diederik P C de Rooy¹, Roula Tsonaka², Maria L E Andersson²+12

• ¹From the Department of Rheumatology, and the Department of Medical Statistics, Leiden University Medical Center, Leiden, the Netherlands; the Section of Rheumatology at the Institution of Clinical Science, Lund University, Skåne University Hospital, Lund, Sweden, for the BARFOT study group; the Department of Genetics, University Medical Center Groningen and University of Groningen, Groningen, The Netherlands; Center of Experimental Rheumatology, University Hospital Zurich, Schlieren, Switzerland; the Department of Medical Genetics, University Medical Center Utrecht, Utrecht, The Netherlands.D.P. de Rooy, LLM, MD, PhD, Department of Rheumatology, Leiden University Medical Center; R. Tsonaka, PhD, Department of Medical Statistics, Leiden University Medical Center; M.L. Andersson, BMS, PhD; K. Forslind, Associate Professor, Senior Consultant, Section of Rheumatology at the Institution of Clinical Science, Lund University, Skåne University Hospital, for the BARFOT study group; A. Zhernakova, MD, PhD, Department of Rheumatology, Leiden University Medical Center, and Department of Genetics, University Medical Center Groningen and University of Groningen; M. Frank-Bertoncelj, MD, PhD, Center of Experimental Rheumatology, University Hospital Zurich; C.G. de Kovel, PhD; B.P. Koeleman, PhD, Department of Medical Genetics, University Medical Center Utrecht; D.M. van der Heijde, MD, PhD; T.W. Huizinga, MD, PhD; R.E. Toes, PhD, Department of Rheumatology, Leiden University Medical Center; J.J. Houwing-Duistermaat, PhD, PD, Department of Medical Statistics, Leiden University Medical Center; C. Ospelt, MD, PhD, Center of Experimental Rheumatology, University Hospital Zurich; B. Svensson, MD, PhD, Section of Rheumatology at the Institution of Clinical Science, Lund University, Skåne University Hospital, for the BARFOT study group; A.H. van der Helm-van Mil, MD, PhD, Department of Rheumatology, Leiden University Medical Center. d.p.c.de_rooy@lumc.nl.+1