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Dear Sir,
The authors thank Lange and Cegolon for pointing out the error in Table I and for their thoughtful comments, which have helped to improve our article.
In Table I, the normal range for carboxyhaemoglobin (HbCO) has been corrected to 0%–10%, and a footnote regarding the HbCO range for non-smokers (0%–2%) and smokers (0%–10%) was also added.
Yours sincerely,
