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Non-steroidal anti-inflammatory drug (NSAID) exposure and gastroprotection use. Short-term: patients who took NSAIDs in the week before hospitalisation but not in the 2–4 weeks before that; Long-term: patients who took NSAIDs at least 1–4 weeks before hospitalisation; Recent: patients who took NSAIDs in the 2–4 weeks before hospitalisation but not in the week before that; Not recent: patients who took NSAIDs but not in the 4 weeks before hospitalisation.
