Key points are not available for this paper at this time.
Department of Anorectal Surgery, Ningbo No.2 Hospital, Ningbo, Zhejiang, China The author has no funding to declare. Category Research Letter The author declares no conflict of interest. The template data collection forms are available from the corresponding author (L.S) upon reasonable request. No primary data was generated and reported in this manuscript. Therefore, data has not become available to any academic repository. Sponsorships or competing interests that may be relevant to content are disclosed at the end of this article. Published online ■ ■ *Corresponding author. Address: Ningbo No.2 Hospital, CHINA. E-mail address: email protected (S. Li). This is an open access article distributed under the Creative Commons Attribution License 4.0 (CCBY), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. http://creativecommons.org/licenses/by/4.0/
Sheng Li (Wed,) studied this question.