Optic neuropathy as an early manifestation of granulomatosis with polyangiitis: a case report and literature review - Kim, Yukang; Woo, Tonghoon; Lee, Sun-Uk; Park, Euyhyun; Shin, Hyun-Jin; Sim, Jongmin; Kim, Gerard Jounghyun; Kim, Ji-Soo (Frontiers in Medicine, 2025)