- Correspondence to Dr George Kwok Chu Wong, Division of Neurosurgery, Department of Surgery, The Chinese University of Hong Kong, Prince of Wales Hospital, 4/F Clinical Science Building, 30-32 Ngan Shing Street, Shatin, New Territories, Hong Kong;
- Received 5 November 2012
- Revised 11 March 2013
- Accepted 20 March 2013
- Published in print 19 April 2013.
- Published online 20 April 2013.
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