Rheumatology (Oxford). 2008 Aug;47(8):1228-30. Ahn JK, Cha HS, Koh EM, Kim SH, Kim YG, Lee CK, Yoo B. Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 50 IIwon-Dong, Gangnam-Gu, Seoul 135-710, Rep…