Conflict of interest

The authors have no conflicts of interest to declare.

Ethical approval

This study was approved by the research ethics committee of Osaka Red Cross Hospital, Approval number (2019–39)/date (Jan 30, 2019).

Informed consent

Written informed consent was obtained from the patient for publication of this study and accompanying images.

Human rights

This study was performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its subsequent amendments.