Park, Ji Yeon
Kim, Yong Jin
Article History
First Online: 12 March 2018
Compliance with Ethical Standards
:
: The authors declare that they have no conflicts of interest.
: The need for patient informed consent for this retrospective study was waived by the institutional review board.
: This study was approved by the institutional ethics committee of Soonchunhyang University Seoul Hospital and has been performed in accordance with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.