All of the undersigned authors wish to publish this manuscript in Clinical Ultrasound, and consent to the following:

• 1. We acknowledge that this manuscript is original and does not infringe on the copyright of any other article.
• 2. All of the authors made substantial contributions to the manuscript, and jointly take responsibility for the content of the manuscript.
• 3. This manuscript has not been previously published, and has not been and will not be, submitted for the purpose of publication in another journal.
• 4. In the event that this manuscript is published in Clinical Ultrasound, we agree to assign all authorities related to copyright to the Korean Association of Clinical Ultrasound.