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DECLARATIONS
Authors’ contributions
Guided the work, decided on content, concepts discussed, overall edition: Nau PN
Made equal contributions regarding writing, design, edition of the entire manuscript, reviewed corrections
and resubmitted the work: Fontan FM, Carroll RS
Made substantial contributions mainly focused on manuscripts selected for references and overall edition:
Thompson D, Lehmann RK, Smith JK

Availability of data and materials
Not applicable.

Financial support and sponsorship
None.

Conflicts of interest
All authors declared that there are no conflicts of interest.

Ethical approval and consent to participate
Not applicable.

Consent for publication
Not applicable.

Copyright
© The Author(s) 2020.

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