R. Hisada1, M. Kato1, E. Sugawara1, Y. Fujieda1, K. Oku1, T. Bohgaki1, O. Amengual1, S. Yasuda1, T. Atsumi1
1Department of Rheumatology, Endocrinology and Nephrology, Graduate School of Medicine and Faculty of Medicine, Hokkaido University, Sapporo, Japan