Article History
Received: 19 June 2018
Accepted: 2 November 2018
First Online: 10 November 2018
Compliance with ethical standards
: All procedures were performed in accordance with the ethical standards of the institutional 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.
: Approval of ethics and study protocol was obtained from the Hospital Research Committee and the Data Protection Official for Research.
: The authors declare that they have no conflict of interest.