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To identify sources of heterogeneity (statistical, methodological, and clinical) in studies evaluating non-steroidal anti-inflammatory drugs (NSAIDs) vs acetaminophen in patients with knee and hip osteoarthritis (OA) to elucidate variations in outcomes.A database search (1966 to January 2010) was made for (randomized) controlled trials ((R)CTs) comparing NSAIDs vs acetaminophen in knee and hip OA...
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