[1] Linkoping Univ, Div Nursing, Dept Social & Welf Studies, Kungsgatan 40, S-60220 Linkoping, Sweden
[2] Jonkoping Univ, Sch Hlth & Welf, Dept Nursing, Jonkoping, Sweden
[3] Linkoping Univ, Div Nursing, Dept Med & Hlth Sci, Linkoping, Sweden
[4] Univ Calif Irvine, Dept Cardiol, Program Nursing Sci, Irvine, CA USA