Correction to: Multicenter comparison of three intraoperative hemoglobin trend monitoring methods.

In the original publication of the article, the ABGHb graph of Fig. 2 was incorrectly rendered during conversion from black and white to color. The figure shows hemoglobin results from the 3 compared monitoring methods to results obtained by laboratory hematology analyzer. Importantly this illustration of secondary outcome was not used for statistical comparisons but is intended to show relative accuracy of the 3 monitoring methods. The corrected Fig. 2 is given in this erratum.