Article History
Accepted: 20 July 2018
First Online: 28 July 2018
Compliance with ethical standards
: The authors declare that they are no financial relationship, conflict of interests, or funding sources.
: “All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.”
: “For this type of study formal consent is not required.”