Key points are not available for this paper at this time.
Correspondence to Bruno Dubois, Inserm E007 and Fédération de Neurologie, Hôpital de la Salpêtrière, 75013 Paris, France. Tel: +33 1 42 16 17 61; fax: +33 1 42 16 27 39; e-mail: email protected
Bruno Dubois (Tue,) studied this question.
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