Funding for this research was provided by:
Korea Institute of Energy Technology Evaluation and Planning (20162220100050, 20161120100350)
Korea Institute of Energy Technology Evaluation and Planning (20172510102130)
National Research Foundation of Korea (NRF-2016H1D5A1910564, 2016R1D1A3B03931927)
Article History
First Online: 25 May 2018
Compliance with ethical standards
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: The authors declare no conflict of interest.