RT Journal Article SR Electronic T1 Valsalva retinopathy JF Postgraduate Medical Journal JO Postgrad Med J FD The Fellowship of Postgraduate Medicine SP 110 OP 110 DO 10.1136/pgmj.2008.073148 VO 85 IS 1000 A1 J Tildsley A1 S Srinivasan YR 2009 UL http://pmj.bmj.com/content/85/1000/110.abstract AB