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Article History

Received: 2 November 2018

Accepted: 10 September 2019

First Online: 13 December 2019

Compliance with ethical standards

: All authors have made substantial contributions to drafting the study protocol and writing the manuscript. The first and second authors were responsible for data collection and summarization.

: CM, TEH, and MV declare that they have no conflict of interest.

: The study was performed conforming to the Helsinki declaration of 1975, as revised in 2000 and 2008 concerning human and animal rights, and the authors followed the policy concerning informed consent as shown on .

: The authors are solely responsible for the data and the contents of the paper. In no way, the Honorary Editor-in-Chief, Editorial Board Members, or the printer/publishers are responsible for the results/findings and content of this article.