1 Linköping University, Center for Medical Image Science and Visualization, Campus US, Linköping SE-581 85, Sweden; Linköping University, Department of Science and Technology-Media and Information Technology, Campus Norrköping, Norrköping SE-601 74, Sweden; Linköping University, Department of Medical and Health Sciences, Campus US, Linköping SE-581 85, Sweden.
2 County Council of Östergötland , Department of Neurosurgery, Linköping University, Campus US, Linköping SE-581 85, Sweden.
3 Linköping University, Center for Medical Image Science and Visualization, Campus US, Linköping SE-581 85, Sweden; Royal Institute of Technology, School of Technology and Health, Alfred Nobels Allé 10, Huddinge SE-141 52, Sweden.
5 Linköping University, Center for Medical Image Science and Visualization, Campus US, Linköping SE-581 85, Sweden; Linköping University, Department of Science and Technology-Media and Information Technology, Campus Norrköping, Norrköping SE-601 74, Sweden; Linköping University, Department of Medical and Health Sciences, Campus US, Linköping SE-581 85, Sweden; Royal Institute of Technology, School of Technology and Health, Alfred Nobels Allé 10, Huddinge SE-141 52, Sweden.