Funding for this research was provided by:
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (320030-169206, 320030-149982)
The Fondation Asile des aveugles and a grantor advised by Carigest SA.
Text and Data Mining valid from 2020-02-04
Received: 10 May 2019
Accepted: 14 January 2020
First Online: 4 February 2020
: The authors declare no competing interests.