RT Journal Article SR Electronic T1 The relative contribution of medical and surgical referrals to the workload in general ophthalmic practice JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 933 OP 935 DO 10.1136/bjo.87.8.933 VO 87 IS 8 A1 K Greiner A1 K McCormack A1 A Grant A1 J V Forrester YR 2003 UL http://bjo.bmj.com/content/87/8/933.abstract AB