Reviewer’s report
Title: 
Administration of oxytocin antagonist at the same time as using a Foley
catheter with cotton swab before embryo transfer for cervical stenosis
Version: 
0 
Date: 
24 May 2021
Reviewer's report:
This is an interesting case report that demonstrated a novel method that may
overcome difficult embryo transfer (ET) in certain cases. The authors made a
detailed presentation of the treatment course of this patient, and a comprehensive
review of various approaches in the literatures. 
There are two points that need to be clarified as in the following
1. MRI was performed after second (?) difficult ET to reveal a fibroid about 1
cm in size 1 cm above the internal os. Was the myoma missed in all the previous
transvaginal ultrasound examinations?
2. In the final sentence of the conclusion, the authors wrote that " In addition, the
risk of obstetr4, ic complications….". Please correct the misspelling. 
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