RT Journal Article SR Electronic T1 Impression cytology in the diagnosis of ocular surface squamous neoplasia JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 888 OP 888 DO 10.1136/bjo.85.7.888a VO 85 IS 7 A1 GLENDA R NOLAN A1 LAWRENCE W HIRST YR 2001 UL http://bjo.bmj.com/content/85/7/888.2.abstract AB