1. Department of Neurosurgery, 401 General Military Hospital of Athens, Athens, Greece
2. Center of Orthopaedics and Regenerative Medicine (C.O.R.E.), Center for Interdisciplinary Research and Innovation (C.I.R.I.), Aristotle University Thessaloniki, Thessaloniki, Greece
3. Department of Interventional and Therapeutic Neuroradiology, Queen's University Hospital, Essex Center for Neurological Sciences, London, UK