Article History
Received: 4 October 2018
Accepted: 26 November 2018
First Online: 3 December 2018
Compliance with ethical standards
:
: No conflict of interest has to be declared by the authors.
: This article did not require ethical approval of any kind.
: This article does not contain any study with animals performed by any of the authors.
: Informed consent was obtained from all individual participants included in the study.