Dept. of Circulation and Medical Imaging, NTNU, Trondheim, Norway
Norwegian University of Science and Technology, National center for spinal diseases, Trondheim, Norway
Medical Faculty, Norwegian University of Science And Technology, Trondheim, Norway
St Olavs University Hospital, TRondheim, Norway
The Norwegian Univeristy of tecknology and science, Trondheim, Norway
NTNU, Trondheim, Norway
Norwegian University of Science and Technology, Faculty of Medicine, Trondheim, Norway
Department of Otolaryngology, Sorlandet Hospital, Kristiansand, Norway
Department of Otolaryngology, Head and Neck Surgery, St Olav University Hospital of Trondheim, and Norwegian University of Science and Technology (NTNU), 7006 Trondheim, Norway, Trondheim, Norway
St Olavs Hospital, Trondheim, Norway
Dept. of Neurology and Clinical Neurophysiology, Norwegian Headache Centre, Trondheim, Norway