- Correspondence to Cheng-Hsien Lu, Department of Neurology, Chang Gung Memorial Hospital, 123 Ta Pei Road, Niao Sung Hsiang, Kaohsiung Hsien, Taiwan;
- Received 16 September 2009
- Revised 23 February 2010
- Accepted 15 March 2010
- Published online 3 August 2010.
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