- Correspondence to Professor Dae Hyun Yoo, Division of Rheumatology, Hanyang University Hospital for Rheumatic Diseases, 220 Wangsimni-Ro, Seongdong-Gu, Seoul 133-792, Republic of Korea; ; Professor Ulf Müller-Ladner, Department of Rheumatology and Clinical Immunology, Justus Liebig University Giessen, Kerckhoff-Klinik GmbH, Benekestrasse 2–8, 61231 Bad Nauheim, Germany;
- Accepted April 19, 2013
- First published May 16, 2013.
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- Data supplement 7 - Online appendix G
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- Data supplement 9 - Online appendix I
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