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Contributors YO: conception and design of the study, interpretation of data, drafting the manuscript for intellectual content. IY: acquisition and analysis of the data, revision of the manuscript for intellectual content. NO: acquisition and analysis of the data. AK: acquisition and analysis of the data. HK: acquisition and analysis of the data. MS: acquisition and analysis of the data. MU: conception and design of the study, critical revision of the manuscript for important intellectual content, drafting the manuscript for intellectual content, final approval of the published version.
Funding Intramural research fund of Shiga University of Medical Science.
Competing interests None declared.
Provenance and peer review Not commissioned. Externally peer reviewed by Nick Davies, London, UK.