1. Department of Internal Medicine, Division of Rheumatology, Seoul St Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul 06591, Republic of Korea
2. Division of Clinical Immunology and Rheumatology, University of Alabama at Birmingham, Birmingham, AL 35294, USA
3. Department of Microbiology and Immunology, University of Otago, Dunedin 9054, New Zealand
4. VA San Diego Healthcare System, San Diego, CA 92161, USA
5. Division of Rheumatology, Autoimmunity and Inflammation, Department of Medicine, University of California San Diego School of Medicine, La Jolla, CA 92093, USA