Review for 10.1186/s12876-020-01534-2 (2020)

Reviewer’s report
Title: 
Narrow band imaging under less-air condition improves the visibility of
superficial esophageal squamous cell carcinoma
Version: 
1 
Date: 
05 Oct 2020
Reviewer's report:
In the revised manuscript, the authors clarified that "Closer view and mild
magnification were applied for all of the lesions under less-air condition".
However, it is concerning to note that the same magnifying function was not
used in standard-air conditions. This raises a natural question whether mild
magnification alone is sufficient, and whether less-air condition is still needed to
achieve the claimed benefits. In addition, it also raises concerns if the benefits
will likely generalize for endoscopist systems without magnification. In the
reviewer's opinion, comparisons should be made with the same magnification to
support the conclusions of the current study.
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