[1] Dept Hlth & Social Care, Lidkoping, Sweden
[2] Skaraborg Hosp, Res & Dev Ctr, Skovde, Sweden
[3] Tibro Hlth Care Ctr, Narhalsan Tibro, Sweden
[4] Univ Gothenburg, Sahlgrenska Acad, Dept Clin Neurosci, Inst Neurosci & Physiol, Gothenburg, Sweden
[5] Sahlgrens Univ Hosp, Dept Neurol, Gothenburg, Sweden
[6] Univ West, Dept Hlth Sci, S-46186 Trollhattan, Sweden
[7] Skaraborg Hosp Skovde, Dept Med, Skovde, Sweden