Funding for this research was provided by:
Sungshin Women’s University (Sungshin Women’s University Research Grant of 2018)
Received: 30 June 2018
Accepted: 17 June 2019
First Online: 24 June 2019
Ethics approval and consent to participate
: This study was approved by Sungshin Women’s University Institutional Review Board (SSWUIRB 2015–056, SSWUIRB 2016–022) and written informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.