1. Royal Dutch Visio—de Brink Vries The Netherlands
2. Department of Pedagogy and Educational Sciences, Unit of Special Needs Education and Youth Care, Faculty of Behavioural and Social Sciences University of Groningen Groningen The Netherlands
3. Research Group Healthy Ageing, Allied Health Care and Nursing Hanzehogeschool Groningen Groningen The Netherlands
4. Ophthalmology Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam Public Health Research Institute Amsterdam The Netherlands