Review for 10.1186/s12876-022-02390-y (2022)

Reviewer’s report
Title: 
Use of Folic Acid Supplementation to Halt and even Reverse the
Progression of Gastric Precancerous Conditions: A Meta-analysis
Version: 
0 
Date: 
07 Feb 2022
Reviewer's report:
1)Introduction: 
Page 5 lines 90-94: The authors claimed using a prospective meta-analysis
which contradicts to the explanation of the methods in the manuscript
(retrospective). The objective of the study need to be revised here as this meta-
analyses did not provide guidance, but just investigate the effect of the folic acid
on GPC in the stomach 
2) Methods:
Page 97-98: The authors wrote statements quality of reporting meta-analyses
starting with a capital letter, can be confusing with statement QUOROM
pg 108-116: Selection criteria. The emphasis should be put on the listed criteria
rather than highlighting unlimited criteria as it is already well understood.
Inclusion criteria no. 3 needs to be revised- I can't grasp what the criteria are. 
pg 117-123: Exclusion criteria no. 3-not clear of what definition guideline the
researchers used. How about the quality of the study? 
pg 134-135: Data collection, suggest to revise the sentence to ease
understanding.
3) Results
Page 249: require consistency in format writing. page 239, the subheading was
bolded but not at here. 
4) Conclusion required
Overall: 
The manuscript requires for proofreading.
Symbol I2, superscript required.
Citation and reference format need to be checked including in the table.
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Is the study design appropriate to answer the research question (including the use
of appropriate controls), and are the conclusions supported by the evidence
presented?
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from apparent manipulation?
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