Funding for this research was provided by:
National Research Foundation of Korea (2018R1D1A1A02085712)
Received: 3 October 2019
Accepted: 23 January 2020
First Online: 10 February 2020
Ethics approval and consent to participate
: The study was approved by the ethics committee of Seoul St. Mary’s Hospital (study number: KC14OISI0768). Written informed consent according to the Declaration of Helsinki was obtained from all study subjects.
: Not applicable.
: The authors declare that they have no competing interests.