Received: 23 February 2021
Accepted: 7 May 2021
First Online: 29 May 2021
: This research was approved by the New Tokyo Hospital Research Ethics Committee and the president of the hospital (committee reference number 0188). The ethics committee waived the requirement to obtain informed consent for the use of patients’ data except for in the five cases (cases 1–5) described in this retrospective study.
: Written informed consent was obtained from the patients (in case 1, case 2, case 4, and case 5) or the patient’s family (in case 3) for publication of this case report and any accompanying images. A copy of the written consent form is available for review by the Editor of this journal.
: The authors declare that they have no competing interests.