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Dominguez-Casas LC, et al. Biologic therapy in severe and refractory peripheral ulcerative keratitis (PUK). Multicenter study of 34 patients. Seminars in Arthritis and Rheumatism 50: 608-615, No. 4, Aug 2020. Available from: URL: http://doi.org/10.1016/j.semarthrit.2020.03.023