Funding for this research was provided by:
Korea Meteorological Administration Research and Development Program (KMIPA2015-8062)
Received: 2 May 2017
Accepted: 12 January 2018
First Online: 1 February 2018
Change Date: 3 May 2018
Change Type: Correction
Change Details: After publication of the original article  the authors flagged that the Funding information in the Declarations was incorrect.
Ethics approval and consent to participate
: This study was approved by the institutional review board of UUH (2016–10-011). Prior to enrollment, we explained the objectives and procedures of this study to the participants and obtained informed consent from them.
: We also obtained consent to publish from the participants.
: The authors declare that they have no competing interests.
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