Funding for this research was provided by:
the Ministry of Science and ICT, Republic of Korea (NRF-2016R1A2B4016318)
Article History
Received: 5 June 2018
Accepted: 7 October 2018
First Online: 19 October 2018
Ethics approval and consent to participate
: The study was approved by the Institutional Review Board of Asan Medical Centre (2014–0805) and all subjects provided written informed consent prior to inclusion.
: Not applicable.
: The authors declare that they have no competing interests.
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