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JIS and H-HW are joint senior authors.
Twitter @MinSeoKim_MD
Contributors MSK, JIS and H-HW contributed to the concept and design of this study. MSK drafted the manuscript. JIS and H-HW supervised the study. MSK, MS, JIS and H-HW participated in the critical revision of the manuscript.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Disclaimer All authors have completed the ICMJE uniform disclosure form at www.icmje.org/coi_disclosure.pdf (available on request from the corresponding author) and declare the following: no support from any organisation for the submitted work; no financial relationships with any organisations that might have an interest in the submitted work in the previous three years; no other relationships or activities that could appear to have influenced the submitted work.
Competing interests None declared.
Provenance and peer review Commissioned; externally peer reviewed.