Identifying predictors of placebo response in osteoarthritis clinical trials of three agents with different routes of delivery: A meta-analysis using individual patient data von Stocks, J., Persson, M.S., van Middelkoop, M., Runhaar, J., Bierma-Zeinstra, S., Atchia, I., Lambert, R., Sawitzke, A.D., McAlindon, T., Hashempur, M.H., Walsh, D.A., Doherty, M., Zhang, W.

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