By Lunn M.P.T.   Crawford T.O.   Hughes R.A.C.   Griffin J.W.   Sheikh K.A.   in Brain

ISSN:1460-2156|125|4|904-911

Oxford University Press‎(2002)‎

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By Hadden R D M   Lunn M P T   Hughes R A C   in Clinical Medicine

ISSN:1470-2118|33|3|219-224

Royal College Of Physicians‎(1999)‎

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