1 Department of Internal Medicine, Narita Red Cross, Iida-Cho, Narita, Chiba, 286-8523, Japan.
2 Division of Rheumatology, Department of Internal Medicine, Toho University Sakura Medical Center, 564-1 Shimoshizu, Sakura, Chiba, 285-8741, Japan.
3 Department of Surgical Pathology, Toho University Sakura Medical Center, 564-1 Shimoshizu, Sakura, Chiba, 285-8741, Japan.
4 Division of Rheumatology, Department of Internal Medicine, Toho University Sakura Medical Center, 564-1 Shimoshizu, Sakura, Chiba, 285-8741, Japan. ihciakokenak@med.toho-u.ac.jp.