Zhu, Chun-Chao
Kim, Tae-Han
Berlth, Felix
Park, Shin-Hoo
Suh, Yun-Suhk
Kong, Seong-Ho
Lee, Hyuk-Joon
Cao, Hui
Yang, Han-Kwang
Article History
Received: 4 November 2017
Accepted: 15 February 2018
First Online: 13 March 2018
Compliance with ethical standards
:
: This retrospective study was conducted ethically in accordance with the Ethical Principles for Medical Research Involving Human Subjects, as outlined in The Declaration of Helsinki after approval of the institutional review board of Seoul National University Hospital (No. 1706-176-864). Informed consent was waved by the institutional review board based on its decision that the risk of this study to the patient is minimal.
: The authors declare that they have no conflict of interest.