Cardiopulmonary exercise testing as a predictor of complications.

I read your article with interest. However, a sentence under the subheading ‘Cardiopulmonary exercise testing’ in the methods section (‘Two key measurements can be determined from these data, [oxygen uptake at peak exercise and anaerobic threshold], indicating the point at which anaerobic metabolism is inadequate to maintain high energy phosphate production […]’) does not coincide with the principle of cardiopulmonary exercise testing. I think you mean ‘indicating the point at which aerobic metabolism is inadequate…’ (The word ‘anaerobic’ should be corrected to ‘aerobic’.)