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