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SHJ and JHY are co-first authors and contributed equally to this work.
Contributors SHJ was involved in the conceiving of and designing the study, funding, and manuscript development and writing. JHY was involved in the conceiving of and designing the study, and manuscript writing. SHK participated in the data acquisition and provided technical support. HGK contributed to the data analysis; and manuscript development, writing and authorisation.
Funding The National Research Foundation (NRF) of Korea Grant funded by the Korean Government (MSIP) (grant number 2015R1A2A2A01004073).
Competing interests None declared.
Ethics approval The study protocol was approved by the Institutional Review Board of Yeungnam University hospital.
Provenance and peer review Not commissioned; externally peer reviewed.
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