Article History
Received: 2 April 2018
Accepted: 28 June 2018
First Online: 10 July 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: Given the nature of the survey in this study, no formal Institutional Review Board approval was necessary. A waiver stating this was obtained. All procedures were in accordance with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.