RT Journal Article SR Electronic T1 Chhabra hydrocephalus shunt: lessons for gravitational valves JF Journal of Neurology, Neurosurgery & Psychiatry JO J Neurol Neurosurg Psychiatry FD BMJ Publishing Group Ltd SP 406 OP 407 DO 10.1136/jnnp.65.3.406 VO 65 IS 3 A1 ZOFIA CZOSNYKA A1 MAREK CZOSNYKA A1 HUGH K RICHARDS A1 JOHN D PICKARD YR 1998 UL http://jnnp.bmj.com/content/65/3/406.abstract AB