RT Journal Article SR Electronic T1 Value based medicine JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 979 OP 979 DO 10.1136/bjo.2003.040030 VO 88 IS 8 A1 M M Brown A1 G C Brown YR 2004 UL http://bjo.bmj.com/content/88/8/979.1.abstract AB