1 Division of Rheumatology (EHP), Department of Internal Medicine, Chung-Ang University College of Medicine, Seoul, Korea; Division of Rheumatology (EHP), Department of Internal Medicine, Chung-Ang University Gwangmyeong Hospital, Gwangmyeong, Korea; Department of Ophthalmology (USK), Chung-Ang University College of Medicine, Seoul, Korea; and Department of Ophthalmology (USK), Chung-Ang University, Gwangmyeong Hospital, Gwangmyeong, Korea.