[1] Katholieke Univ Leuven, Ctr Hlth Serv & Nursing Res, B-3000 Louvain, Belgium
[2] Katholieke Univ Leuven, Sch Med, Univ Hosp Leuven, Heart Transplant Program, Louvain, Belgium
[3] Katholieke Univ Leuven, Sch Med, Univ Hosp Leuven, Pediat Transplant Program, Louvain, Belgium
[4] Univ Basel, Inst Nursing Sci, Basel, Switzerland