Masilionyte, Monika http://orcid.org/0000-0003-4616-5997
Gutknecht, Norbert
Article History
Received: 2 February 2018
Accepted: 28 May 2018
First Online: 8 June 2018
Compliance with ethical standards
: For this type of study, formal consent is not required.
: The authors declare that they have no conflict of interest.