Article History
Received: 4 June 2018
Accepted: 17 September 2018
First Online: 26 September 2018
Compliance with ethical standards
: The institutional review board approved the methods and procedures for this study.
: None.
: 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.