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Definition of time-variant oral glucocorticoid exposure variables. Inclusion criteria included a diagnosis of inflammatory bowel disease, systemic lupus erythematosus, polymyalgia rheumatica, giant cell arteritis, rheumatoid arthritis, and/or vasculitis before or during the study period (1 January 1998 to 15 March 2017). GC, glucocorticoid; PED, prednisolone equivalent dose.
