Published on in Vol 2 , No 1 (2019) :Jan-Jun

1 Department of Special Education and Rehabilitation Science , University of Cologne , Cologne , DE
2 “Dynamics of Healthy Aging” University Research Priority Program , University of Zurich , Zurich , CH
3 Center of Competence for Gerontology , University of Zurich , Zurich , CH
4 Mixed Methods Research , Heidelberg University of Education , Heidelberg , DE