1. Department of Neurosurgery, University Hospital Zürich, Zürich, Switzerland
2. Department of Neurosurgery, National University Hospital, Singapore
3. Department of Neurosurgery, National Neuroscience Institute, Singapore
4. Department of Neurosurgery, The Alfred Hospital, Monash University Medical School, Melbourne, Australia
5. Department of Research and Development, Volume Interactions Pte. Ltd., Singapore, Singapore