RT Journal Article SR Electronic T1 Normal pressure hydrocephalus: false positives JF Practical Neurology JO Pract Neurol FD BMJ Publishing Group Ltd SP 264 OP 264 DO 10.1136/jnnp.2006.097683 VO 6 IS 4 A1 Martin J Larner A1 Andrew J Larner YR 2006 UL http://pn.bmj.com/content/6/4/264.1.abstract AB