1. Department of Neurosurgery; St. Olavs University Hospital; Trondheim Norway
2. Department of Neuroscience; Norwegian University of Science and Technology; Trondheim Norway
3. National Competence Center for Ultrasound and Image Guided Therapy; St. Olavs University Hospital; Trondheim Norway
4. Department of Neurosurgery; Sahlgrenska University Hospital; Gothenburg Sweden
5. Department of Anesthesia; St. Olavs University Hospital; Trondheim Norway
6. Department of Circulation and Medical Imaging; Norwegian University of Science and Technology; Trondheim Norway
7. Department of Rheumatology; St. Olavs University Hospital; Trondheim Norway
8. National Advisory Unit on Spinal Surgery Center for Spinal Disorders; St. Olavs University Hospital; Trondheim Norway
9. Norwegian National Registry for Spine Surgery; University Hospital of Northern Norway; Tromsø Norway
10. Department of Neurosurgery; University Hospital of Northern Norway; Tromsø Norway
11. Norwegian Centre of Competence in Deep Brain Stimulation for Movement Disorders; St. Olavs University Hospital; Trondheim Norway