Article History
Received: 30 January 2019
Accepted: 29 April 2019
First Online: 9 May 2019
Compliance with ethical standards
: All procedures performed in this study were in accordance with the ethical standards of the institute and with the 1964 Helsinki Declaration and its later amendments. Formal consent was not required for the collection of this data.
: For this type of study, formal consent is not required.
: The authors declare that they have no conflict of interest.