Review for 10.1186/s12876-021-01629-4 (2021)

Reviewer’s report
Title: 
Case series of aortoenteric fistula: A rare cause of gastrointestinal bleeding
Version: 
1 
Date: 
22 Nov 2020
Reviewer's report:
I read with interest the revised version of the Manuscript. 
I appreciated the changes made in order to address the previously reported
issues. Aortoenteric fistula are rare and severe occurrences, therefore I think it is
important to collect as many data as possible to improve the possibility of a
correct diagnosis and management. 
I still have some minor comments: 
1. As regards the use of the term "incidence" in the background section, I
strongly suggest that the sentences should be reformulated or the term changed.
For example
- "Voorhoeve and colleagues have described an incidence of 0.04-0.07% among
patients who died due to a massive GI hemorrhage": in this case 0.04-0.07%
sounds like a prevalence among patients died of haemorrhage, not an incidence. 
- And it follows: The incidence of SAEF has been reported to range from 0.36%
to 1.6%: unfortunately I don't have access the original papers cited as reference,
but also in this case either it a time reference is reported ("lifelong
incidence"/"yearly incidence"/incidence during a 5 year follow up"?) or it is
inappropriate to talk about incidence. 
2. A language revision should be performed by a native English speaker
proficient in scientific reporting. 
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