1.   The next step is to obtain arterial blood gas measurements.

2.   The median and minimum of five local blood flow measurements performed in each patient were inversely correlated with the endoscopic recurrence grade.

3.   Arterial blood gas measurements were compared in the two treatment groups with unpaired t-tests on differences, and between the three centres using analysis of variance.

4.   The limitations of the GlucoWatch are that it requires a three-hour warm-up period and calibration from a finger-stick blood measurement.