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Article History

Received: 5 January 2018

Revised: 15 April 2018

Accepted: 26 April 2018

First Online: 12 June 2018

Compliance with ethical standards

:

: The scientific guarantor of this publication is Professor Wing P. Chan.

: The authors of this manuscript declare no relationships with any companies whose products or services may be related to the subject matter of the article.

: No complex statistical methods were necessary for this paper.

: Written informed consent was waived by the institutional review board.

: Institutional review board approval was obtained.

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