Footnotes

• Contributors HWC performed the procedure and submitted the manuscript. BK assisted in the procedure and wrote the draft. SJK and SIS prepared and edited the manuscript. THC performed operation, revised the manuscript and gave advice.

• Competing interests None.

• Patient consent Obtained.

• Provenance and peer review Not commissioned; internally peer reviewed.

• Study approval Keimyung University Dong San Medical Center review board thought the study approval could be waived.