Yoon, Duck Mi
Yoon, Kyung Bong
Baek, In Chan
Ko, Seo Hee
Kim, Shin Hyung
Article History
Received: 6 September 2017
Accepted: 3 January 2018
First Online: 17 January 2018
Compliance with ethical standards
: This study was approved by the institutional review board of Severance Hospital, Yonsei University Health System (IRB No. 4-2017-0285).
: The authors declare that they have no conflict of interest.