FIGURE 1.

Visibility scores. The degree of endoscope lens cloudiness was scored as follows: (a) Grade 0 was defined as a condition in which the endoscope lens was fog‐free or, if it was cloudy, it could be easily cleaned by spraying water; (b) Grade 1 was defined as a condition in which the endoscope lens could not be defogged by spraying water, but the cloudiness did not prevent mucosa observation; and (c) Grade 2 was defined as a condition in which the endoscope lens was so cloudy that it could not be defogged by spraying water and the mucosa could not be observed.