1. Department of Clinical Neuroscience; Section for Neurosurgery; Karolinska Institutet and Department of Neurosurgery; Karolinska University Hospital; Stockholm Sweden
2. Department of Neurosurgery; Copenhagen University Hospital Rigshospitalet; Copenhagen Denmark
3. Department of Neurosurgery; University Hospital of North Norway; Tromsø Norway
4. Department of Neurosurgery; St.Olav University Hospital; Trondheim Norway
5. Department of Neuroscience; Norwegian University of Science and Technology; Trondheim Norway
6. Norwegian National Advisory Unit for Ultrasound and Image-Guided Therapy; St.Olav Hospital; Trondheim Norway
7. Department of Neurosurgery; Sahlgrenska Univerity Hospital; Gothenburg Sweden
8. Institute of Neuroscience and Physiology; University of Gothenburg; Sahlgrenska Academy; Gothenburg Sweden