Funding for this research was provided by:
Merck Sharp & Dohme, Seoul, South Korea (M20197901)
Received: 9 February 2020
Accepted: 22 June 2020
First Online: 29 June 2020
Ethics approval and consent to participate
: Our study was approved by the Institutional Review Board of Ewha Womans University (IRB File No. 168–10).
: Not applicable.
: Authors were financially supported by MSD Korea.