1. Department of Rheumatology; St. Vincent's Hospital; The Catholic University of Korea; Suwon Korea
2. Division of Rheumatology; Department of Internal Medicine; Kyungpook National University Hospital; Daegu Korea
3. Division of Rheumatology; Department of Internal Medicine; Ajou University Hospital; Seoul Korea
4. Division of Rheumatology; Department of Internal Medicine; Chonnam National University Hospital; Gwangju Korea
5. Division of Rheumatology; Department of Internal Medicine; Ewha Womans University Mokdong Hospital; Seoul Korea
6. Division of Rheumatology; Department of Internal Medicine; Inje University Ilsan Paik Hospital; Goyang Korea
7. Division of Rheumatology; Department of Internal Medicine; Hanyang University Hospital; Seoul Korea
8. Division of Rheumatology; Department of Internal Medicine; Hanyang University Guri Hospital; Guri-si Korea