RT Journal Article SR Electronic T1 A very unusual headache JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP 58 OP 60 DO 10.7861/clinmedicine.14-1-58 VO 14 IS 1 A1 Adam P Croft A1 Kurdow Nader A1 Nirmalan Arulanantham YR 2014 UL http://www.rcpjournals.org/content/14/1/58.abstract