Review for 10.1186/s12876-021-01731-7 (2021)

Reviewer’s report
Title: 
Oesophageal squamous cell carcinoma mimicking submucosal tumour
Version: 
0 
Date: 
16 Dec 2020
Reviewer's report:
Comment 1:
In page 2 line 17, there is a wrong grammar:
"...; the lesion was heterogeneously hypoechoic. and had a clear boundary."
Comment 2:
Would you please provide a clear endoscopic ultrasound picture of the lesion
(especially to show the location from muscularis mucosa)?
Comment 3:
The similar article was published by Masayuki Shibata et al. in Gastroenterology
2017;152:e6-e7. What's the novelty of this case report from other published
reports?
Comment 4:
Does this patient has risk factors of esopahgeal squamous cell carcinoma, such
as alcohol consumption, betel nut chewing and cigarette smoking?
Comment 5:
Can you talk more about association of family history and esopahgeal squamous
cell carcinoma?
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