Article History
Received: 5 January 2018
Accepted: 21 April 2018
First Online: 26 April 2018
Compliance with ethical standards
:
: The authors declare that they have no competing interests.
: This article does not require ethical approval of any kind.
: This article does not contain any studies with human participants or animals performed by any of the authors.
: The informed consent was obtained from all individual participants included in the study.