Funding for this research was provided by:
Received: 14 September 2019
Accepted: 19 February 2020
First Online: 26 February 2020
Ethics approval and consent to participate
: This prospective, observational study was approved by the Institutional Review Board of Korea University Anam Hospital (2017AN0268). Written informed consent of patients was obtained according to the Declaration of Helsinki. We also registered in ClinicalTrials.gov (NCT03299621).
: Not applicable.
: The authors declare that they have no competing interests.