Funding for this research was provided by:
Seoul National University Hospital (0320150450)
Text and Data Mining valid from 2018-03-08
Accepted: 7 February 2018
First Online: 8 March 2018
Compliance with ethical standards
: This study was approved by the institutional review board of the Seoul National University Hospital (IRB No. 1509-062-703, approval date July 13, 2016), and it was conducted in accordance with the Declaration of Helsinki. Written informed consent was obtained from all participants.
: The authors declare that they have no conflict of interest.