[1] Royal Brisbane & Womens Hosp, Dept Neurol, Brisbane, Qld, Australia
[2] Royal Brisbane & Womens Hosp, Dept Neurosurg, Brisbane, Qld, Australia
[3] Royal Brisbane & Womens Hosp, Dept Neuroradiol, Brisbane, Qld, Australia
[4] Univ Queensland, Dept Med, St Lucia, Qld 4067, Australia
[5] Univ Queensland, Dept Surg, St Lucia, Qld 4067, Australia