- Correspondence to Shuhei Kawabata, Department of Neurosurgery, Kobe City Medical Center General Hospital 2-2-1, Minatojimaminamimachi, Chuo-ku, Kobe 650-0047, Japan;
- Received April 26, 2017
- Revised June 24, 2017
- Accepted June 26, 2017
- First published July 14, 2017.
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