Funding for this research was provided by:
Program council Visual Sector (VJ2016-03)
Received: 15 August 2019
Accepted: 26 March 2020
First Online: 16 April 2020
Ethics approval and consent to participate
: The study protocol for the pilot testing CFP+ was approved on March 22, 2017, by the Ethical Committee of the Department of Pedagogy and Educational Sciences at the University of Groningen, the Netherlands. DSPs and family members of adults with VSPID who participated in the study were informed about the study at the outset and gave their written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.