- Correspondence to Prof Yongjun Wang, Department of Neurology, Beijing Tiantan Hospital, 6 Tiantan Xili, Dongcheng District, Beijing 100050;
- Received 12 June 2017
- Accepted 14 June 2017
- Published in print 9 September 2017.
- Published online 12 September 2017.
- Published first 21 June 2017.
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