Funding for this research was provided by:
National Research Foundation of Korea ((2014R1A1A2055872))
Received: 19 October 2020
Accepted: 14 December 2020
First Online: 6 January 2021
Ethics approval and consent to participate
: The study protocol conformed to the ethical guidelines of the 1975 Declaration of Helsinki, and it was approved by institutional review board of Gangnam Severance Hospital (3–2015-0019). Written informed consent was obtained from all participants.
: All the authors read final version of manuscript and approved publication.
: The authors declare that there is no competing interest.