Text and Data Mining valid from 2018-04-17
Received: 7 September 2017
Accepted: 2 March 2018
First Online: 17 April 2018
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards. The study was approved by the Ethics Committee of Ioannina University Hospital.
: Informed consent was obtained from all individual participants included in the study.
: This work has not been published previously and it is not under consideration for publication elsewhere. The publication is approved by all authors and, if accepted, it will not be published elsewhere in the same form, in English or in any other language, including electronically, without the written consent of the copyright-holder.