RT Journal Article SR Electronic T1 Current preoperative marking practice by UK ophthalmologists JF Quality and Safety in Health Care JO Qual Saf Health Care FD BMJ Publishing Group Ltd SP 240 OP 240 DO 10.1136/qshc.2006.021907 VO 16 IS 3 A1 Oliver J Baylis A1 Scott G Fraser YR 2007 UL http://qualitysafety.bmj.com/content/16/3/240.1.abstract AB