1. Center for Sensory-Motor Interaction, Department of Health Science and Technology, Aalborg University, Fredrik Bajers Vej 7 D-3, DK-9220 Aalborg, Denmark
2. Department of Development and Planning, Aalborg University, Fibigerstræde 13, DK-9220 Aalborg, Denmark
3. Department of Health Science and Technology, Aalborg University, Fredrik Bajers Vej 7 D-3, DK-9220 Aalborg, Denmark
4. Department of Cardiology, Vendsyssel Hospital, Frederikshavn, Barfredsvej 83, DK-9900 Frederikshavn, Denmark