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In the article mentioned above, the sensitivity and specificity were reversed erroneously. The sensitivity of NRS >3 must be 97·2% and the specificity 72%. The sensitivity of NRS >4 must be 96·7% and specificity 83%. The sensitivity of NRS >5 must be 85% and the specificity 94%. The conclusion in the article presented is correct. The appropriate ROC curve:

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The authors sincerely apologise for this error.