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Article History

Received: 19 December 2017

Accepted: 23 July 2018

First Online: 3 August 2018

Ethics approval and consent to participate

: As this study relied on de-identified mortality and population data only, ethics approval was not required.

: As this mortality study is an aggregate analysis of decedents and populations, no consent was required.

: The authors declare no conflicts of interest.

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