RT Journal Article SR Electronic T1 A small left pupil and a headache JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP 402 OP 404 DO 10.7861/clinmedicine.11-4-402 VO 11 IS 4 A1 Phey Ming Yeap A1 Christos Tziotzios A1 Nigel McMillan A1 Matthew Walters YR 2011 UL http://www.rcpjournals.org/content/11/4/402.abstract