Received: 28 December 2020
Accepted: 11 May 2021
First Online: 27 May 2021
: This research was approved by the ethical committee of Kawashima Hospital (approval number, 0302). The original data were totally anonymized, and therefore, there were no risks to the privacy of patients. The data presented in the current manuscript did not contain any images, videos, or voice recording, which might have a risk for identifying an individual.
: Not applicable.
: The authors declare that they have no competing interests.