Text and Data Mining valid from 2018-04-27
Received: 21 December 2017
Accepted: 22 January 2018
First Online: 27 April 2018
Compliance with ethical standards
: Song Hee Oh, Ju Hee Kang, Yoon Joo Choi, Bok-Yeol Kim, Sae Rom Lee, Se Hyung Lee, Yong-Suk Choi, and Eui-Hwan Hwang declare that they have no conflict of interest.
: All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1964 and later versions. Informed consent was obtained from all patients for being included in the study.
: This article does not contain any studies with animal subjects performed by any of the authors.