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D. Revicki, R. Hays, D. Cella, and J. Sloan. Journal of clinical epidemiology, 61 (2):
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G. Norman, F. Sridhar, G. Guyatt, and S. Walter. Medical care, 39 (10):
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A. Linden, and S. Samuels. Journal of evaluation in clinical practice, 19 (5):
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