Received: 19 March 2018
Accepted: 7 August 2018
First Online: 8 October 2018
Ethics approval and consent to participate
: All procedures performed in this study 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. The study protocol and the questionnaire were approved by the Hellenic Federation of the Deaf, which is the official representative association of deaf and hard of hearing people in Greece, with the reference number 435/13–3-2015. Also, written license for the use of SF-36 was taken (Lic. No.: SLA QM027680 – CT164283/OP040288). Questionnaires were distributed and collected from April 2015 to June 2015. All participants were informed about the aim and procedures of this study (additionally in GSL if it was necessary) and gave their consent.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.