Article History
Received: 12 November 2018
Accepted: 14 January 2019
First Online: 28 January 2019
Compliance with ethical standards
:
: DAF declares no conflict of interest. VAM declares no conflict of interest. SH declares no conflict of interest.
: This was deemed to not be required.
: This article does not contain any direct involvement of human participants as it is comprised of data from papers already published.
: Informed consent was not necessary for this study.