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Study the past if you would define the future (Confucius)

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Footnotes

  • Contributors Conception or design of the manuscript: TK and EC. Acquisition, analysis or interpretation of data: TK and EC.

  • 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.

  • Competing interests None declared.

  • Provenance and peer review Commissioned; internally peer reviewed.

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