1. Department of Rheumatology, National Hospital Organization, Osaka-Minami Medical Center, Osaka, Japan;
2. Department of Surgery, National Hospital Organization, Osaka-Minami Medical Center, Osaka, Japan;
3. Department of Pathology, Kishiwada City Hospital, Osaka, Japan;
4. Department of Pathology, International University of Health and Welfare, Japan;
5. Department of Pathology, National Hospital Organization, Osaka-Minami Medical Center, Osaka, Japan