- Correspondence to Professor Byung Moon Kim, Interventional Neuroradiology, Department of Radiology, Severance stroke center, Severance Hospital, Yonsei University College of Medicine, Seoul 03722, Republic of Korea;
- Received 10 November 2017
- Revised 31 January 2018
- Accepted 19 February 2018
- Published online 8 March 2018.
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