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Norman GR, Sloan JA, Wyrwich KW. Interpretation of changes in health-related quality of life: the remarkable universality of half a standard deviation. Med Care. 2003;41:582-592.
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(2003)
Med Care
, vol.41
, pp. 582-592
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Norman, G.R.1
Sloan, J.A.2
Wyrwich, K.W.3
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