[1] Linkoping Univ Hosp, Dept Neurophysiol, S-58185 Linkoping, Sweden
[2] Linkoping Univ, Fac Hlth Sci, Dept Med & Care, Linkoping, Sweden
[3] Linkoping Univ Hosp, Dept Cardiol, S-58185 Linkoping, Sweden
[4] Cty Hosp Ryhov, Dept Internal Med, Jonkoping, Sweden
[5] Linkoping Univ, Fac Hlth Sci, Dept Neurosci & Locomot, Linkoping, Sweden
[6] Vaxjo Univ, Sch Hlth Sci & Social Work, Vaxjo, Sweden