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da Costa L, Robertson A, Bethune A, MacDonald MJ, Shek PN, Taylor MJ, Pang EW.da Costa L, et al. Among authors: shek pn.J Neurol Neurosurg Psychiatry. 2015 Sep;86(9):1008-15. doi: 10.1136/jnnp-2014-308571. Epub 2014 Oct 16.J Neurol Neurosurg Psychiatry. 2015.PMID: 25324505Free PMC article.