1. Department of Rheumatology, Clinical Research Center for Rheumatic Diseases, NHO Kumamoto Saishunsou National Hospital, Kohshi, Kumamoto, Japan
2. Yoshitama Clinic for Rheumatic Diseases, Kirishima, Kagoshima, Japan
3. Department of Public Health, Nagasaki University, Graduate School of Biomedical Sciences, Nagasaki, Japan
4. Institute of Rheumatology, Zenjinkai Shimin-no-Mori Hospital, Miyazaki, Japan
5. Rheumatic and Collagen Disease Center, Sasebo Chuo Hospital, Sasebo, Nagasaki, Japan