Dr. Kojima graduated from Nagoya University School of Medicine in 1990 and completed graduate studies at the same university in 1998. Post-doctoral fellow at Shriners Hospital and McGill University. Former Associate and Clinical Professor in Orthopedic Surgery at Nagoya University. In 2022, transferred to the National Hospital Organization Nagoya Medical Center. Since 2024, serving as Vice President and Chief of Orthopedic Surgery. Specializes in rheumatoid arthritis and joint surgery. Has led and participated in many multicenter collaborative studies on rheumatoid arthritis treatment. Contributed to the development of the JCR Clinical Practice Guidelines for Rheumatoid Arthritis in 2014, 2020, and 2024.