RT Journal Article SR Electronic T1 Handstand induced visual loss: Valsalva retinopathy JF BMJ Case Reports FD BMJ Publishing Group Ltd SP bcr2014206733 DO 10.1136/bcr-2014-206733 VO 2014 A1 Huw Oliphant A1 Christopher Holmes A1 Ali Hassan A1 Paul Baddeley YR 2014 UL http://casereports.bmj.com/content/2014/bcr-2014-206733.abstract AB