[1] Linkoping Univ Hosp, Dept Clin Neurophysiol, S-58185 Linkoping, Sweden
[2] Linkoping Univ, Fac Hlth Sci, Dept Med & Hlth Sci, Div Nursing Sci, S-58183 Linkoping, Sweden
[3] Linkoping Univ, Dept Hlth & Soc, Div Social Med & Publ Hlth Sci, Fac Hlth Sci, S-58183 Linkoping, Sweden
[4] Linkoping Univ Hosp, Dept Cardiol, S-58185 Linkoping, Sweden
[5] Linkoping Univ, Inst Clin & Expt Med, Fac Hlth Sci, S-58183 Linkoping, Sweden
[6] Jonkoping Univ, Dept Nursing Sci, Sch Hlth Sci, Jonkoping, Sweden