Funding for this research was provided by:
Ministry of Science and Higher Education ((#626/STYP/12/2017)
Narodowe Centrum Nauki (#2017/25/B/HS6/00561)
Article History
Received: 31 May 2019
Revised: 18 September 2020
Accepted: 16 April 2021
First Online: 12 October 2021
Declarations
:
: The authors declare no conflict of interest.
: The study was performed in accordance to the Declaration of Helsinki on Biomedical Studies Involving Human Subjects. The study design and consent approach were approved by the Institutional Ethics Review Board and the Polish Association of the Deaf.
: Informed written consent was obtained from all participants.