[1] Univ Coll Dublin, Sch Psychol, Ctr Disabil Studies, Dublin 4, Ireland
[2] Radboud Univ Nijmegen, Dept Primary & Community Care, Nijmegen, Netherlands
[3] Radboud Univ Nijmegen, Dept Primary & Community Care, Med Ctr, Nijmegen, Netherlands
[4] Wageningen Univ & Res, Res Methodol Grp, Wageningen, Netherlands