Statistics from Altmetric.com
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.
In the April 2000 issue of theBJO there was a subediting error in Table 1 (p 433) of the paper by Frost and Sparrow (2000;84:432–4). The word “operated” should have been removed from lines 4 and 7 in the body of the table. We apologise to the authors and readers for this error.