RT Journal Article SR Electronic T1 Horse's tail in bamboo spine: the ‘cauda equina syndrome in ankylosing spondylitis’ JF Practical Neurology JO Pract Neurol FD BMJ Publishing Group Ltd SP 418 OP 421 DO 10.1136/practneurol-2014-000868 VO 14 IS 6 A1 Lo, Christine A1 Nair, Krishnan Padmakumari Sivaraman A1 Romanowski, Charles Anthony Jozef A1 Fawthorpe, Fiona Wendy A1 Lindert, Ralf-Björn YR 2014 UL http://pn.bmj.com/content/14/6/418.abstract AB