Article History
Received: 28 March 2018
Accepted: 3 September 2018
First Online: 7 September 2018
Compliance with ethical standards
:
: Research involving human participants and/or animals.
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with ethical standards of the institutional research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study. For this type of study formal consent is not required.