RT Journal Article SR Electronic T1 Persistent vomiting JF Practical Neurology JO Pract Neurol FD BMJ Publishing Group Ltd SP 46 OP 49 DO 10.1136/jnnp.2008.168203 VO 9 IS 1 A1 H Ramadan A1 A Lansbury A1 P Stanley YR 2009 UL http://pn.bmj.com/content/9/1/46.abstract AB