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Decision tree. Reproduction of clinical reality observed in patients with osteoarthritis (OA) receiving one of the alternatives to be compared for the treatment of joint pain, found in each of the three health care levels at the Instituto Mexicano del Seguro Social, identifying the probability to control pain, as well as the development of gastrointestinal, renal and/or cardiovascular complications. NSAIDs, nonsteroidal anti-inflammatory drugs; GI, gastrointestinal.
