Received: 13 December 2020
Accepted: 29 March 2021
First Online: 6 April 2021
: The autopsy was permitted by his family members and conducted under the approved protocol by local ethics committee (Seoul National University Hospital).
: The study has been conducted in accordance with The Code of Ethics of the World Medical Association (Declaration of Helsinki), the informed consent from the patient to participate in the study was waived by local ethics committee (Kyung Hee University Hospital), and the written consent for publication was obtained from the kin of the patient.
: The authors declare that they have no competing interests.