1 Division of Neuroradiology, Joint Department of Medical Imaging, Toronto Western Hospital, University Health Network, Toronto, Ontario, Canada. vionishc@gmail.com.
2 Division of Neurosurgery, Department of Surgery, Fu Jen Catholic University Hospital, Fu Jen Catholic University, New Taipei City, Taiwan, Republic of China. vionishc@gmail.com.
3 Division of Neuroradiology, Joint Department of Medical Imaging, Toronto Western Hospital, University Health Network, Toronto, Ontario, Canada.
4 Department of Clinical Radiology, Kuopio University Hospital, Kuopio, Finland.