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DECLARATIONS
Authors’ contributions
Made substantial contributions to conception and design of the review and performed data acquisition:
Vandiver AR, Hogan SR

Availability of data and materials
Not applicable.

Financial support and sponsorship
None.

Conflicts of interest
Both 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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