M. Akahoshi-Ikeda, S. Yoshizawa, J. Motoshita, M. Furue, and S. Takeuchi, “A Case of Pyoderma Gangrenosum in a Patient with Rheumatoid Arthritis Treated with Abatacept”, Acta Derm Venereol, vol. 96, no. 6, pp. 822–823, Mar. 2016.